Xbox controller layout

This is a list of controller layouts available in the Halo games for the Xbox, the Xbox 360, and the Xbox One.

Stick layouts
All Halo games save for the Halo Wars feature the same four stick layouts.

Default
Left Stick - Move Forward/Backward | Strafe Left/Right

Right Stick - Look Up/Down | Rotate Left/Right

Southpaw
"For Lefties" Left Stick - Look Up/Down | Rotate Left/Right

Right Stick - Move Forward/Backward | Strafe Left/Right

Legacy
"An older way of doing things."

Left Stick - Move Forward/Backward | Rotate Left/Right

Right Stick - Look Up/Down | Strafe Left/Right

Legacy Southpaw
"An older way of doing things for lefties"

Left Stick - Look Up/Down | Strafe Left/Right

Right Stick - Move Forward/Backward | Rotate Left/Right

Halo: Combat Evolved
Xbox A - Jump

B - Melee attack

X - Reload weapon/Action

Y - Switch weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog - Camera

Right Analog Click - Zoom

Right Trigger - Fire primary weapon

Left Trigger - Throw grenade

"Back" Button - Go back/Multiplayer score

"Start" Button - Pause gane

Directional Pad - Menu Movement

Directional Pad Up - Teamspeak

Black Button - Switch grenades

White Button - Flashlight/Teamspeak

Xbox 360 A - Jump

B - Melee attack

X - Reload weapon/Action

Y - Switch weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog - Camera

Right Analog Click - Zoom

Right Trigger - Fire weapon

Left Trigger - Throw grenade

"Back" Button - Go back/Multiplayer score

"Start" Button - Pause

Directional Pad - Menu Movement

Directional Pad Up - Teamspeak

Right Bumper - Switch grenades

Left Bumper - Flashlight/Teamspeak

Halo 2
Xbox A - Jump

B - Melee attack

X - Reload weapon/Swap weapon/Action

Y - Switch weapons/Duel wield weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog - Camera

Right Analog Click - Zoom

Right Trigger - Fire weapon

Left Trigger - Throw grenade/Fire secondary weapon/E-brake/Boost

"Back" Button - Go back/Multiplayer score

"Start" Button - Pause

Directional Pad - Menu Movement

Directional Pad Up - Teamspeak

Directional Pad Down - Lower weapon

Black Button - Switch grenades

White Button - Flashlight/Invisibility/Teamspeak

Xbox 360 A - Jump

B - Melee attack

X - Reload weapon/Swap weapon/Action

Y - Switch weapons/Duel wield

Left Analog Stick - Movement

Push Left Analog Stick - Crouch

Right Analog Stick - Camera

Push Right Analog Stick - Zoom

Right Trigger - Fire weapon

Left Trigger - Throw grenade/Fire secondary weapon/E-brake/Boost

"Back" Button - Go back/Multiplayer score

"Start" Button - Pause

Directional Pad - Menu Movement

Directional Pad Up - Teamspeak

Directional Pad Down - Lower weapon

Right Bumper - Switch grenades

Left Bumper - Flashlight/Teamspeak

Halo 3
Default A - Jump

B - Melee Attack

X - Use Equipment

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Analog - Aiming

Right Trigger - Use Right Weapon

Left Trigger - Use Left Weapon/Throw Grenade

Up on Directional Pad - Team Chat

Right Bumper - Action/Reload Right Weapon

Left Bumper - Reload/Swap Left Weapon

D-Pad - Activates/Deactivates Flashlight

 This is the most common control scheme despite many flaws (see below) that often become apparent to more experienced players. This is the control scheme that Bungie starts you with, but it is suggested that one quickly learns to either use the claw grip, bumper jumper, walkie talkie, or possibly even green thumb, all of which are more often used by experienced players.

Please note that it is not possible to aim while meleeing, jumping, and deploying equipment without use of the "claw grip." Southpaw

A - Jump

B - Melee Attack

X - Use Equipment

Y - Swap Weapons

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Trigger - Use Left Weapon

Left Trigger - Use Right Weapon

Up on Directional Pad - Team Chat

Right Bumper - Action/Reload Right Weapon

Left Bumper - Reload/Swap Left Weapon

 This is the same as default except that the triggers are switched.

Please note that if you compare new players using all button layouts this is the most accurate. Because unlike all of the other layouts offered in the game this is the only one that you are not required to use the same hand to shoot and aim with. Therefore having more reaction time and accuracy. Boxer

A - Jump

B - Throw Grenade

X - Use Equipment

Y - Swap Weapons

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Trigger - Use Right Weapon

Left Trigger - Melee/Use Left Weapon

Up on Directional Pad - Team Chat

Right Bumper - Action/Reload Right Weapon

Left Bumper - Reload/Swap Left Weapon

 This has the advantage of giving the user aim while meleeing, but has the disadvantage of not allowing you to aim while throwing grenades.

Please note that it is not possible to aim while throwing grenades, jumping, and deploying equipment without use of the "claw grip." Green Thumb

A - Jump

B - Zoom View

X - Use Equipment

Y - Swap Weapons

Left Analog Click - Crouch

Right Analog Click - Melee Attack

Right Trigger - Use Right Weapon

Left Trigger - Use Left Weapon

Up on Directional Pad - Team Chat

Right Bumper - Action/Reload Right Weapon

Left Bumper - Reload/Swap Left Weapon

 This has the advantage of giving you some control over your aim while meleeing without compromising the aim of your grenades. However it is considered hard to learn and can be somewhat unreliable if not mastered.

Please note that it is not possible to aim while zooming, jumping, and deploying equipment without use of the "claw grip."

Also this is very similar to the default Call of Duty controls. Bumper Jumper

A - Reload/Swap Left Weapon/change grenade type

B - Action/Reload Right Weapon

X - Use Equipment

Y - Swap Weapons

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Trigger - Use Right Weapon

Left Trigger - Use Left Weapon

Up on Directional Pad - Team Chat

Right Bumper - Melee Attack

Left Bumper - Jump

 This has been called by many to be the best possible controller configuration as you can aim while meleeing, jumping, zooming, and throwing grenades without having to use the uncomfortable claw grip usually only taking a few days to learn.

Please note that it is not possible to aim while deploying equipment without use of the "claw grip," although this is not much of a deterrent for most.

Bungie originally considered this as the default control scheme of Halo 3, but thought it would be too radically different to players used to Halo: Combat Evolved and Halo 2 and so altered it into the actual default configuration. However, with its relative popularity among Bungie workers, it was kept as an alternate configuration.

Using the Banshee becomes much easier with this control scheme, seeing as how you can use your cannon and aim, as well as perform tricks and determine your trajectory at the same time. Walkie Talkie

A - Jump

B - Action/Reload Right Weapon

X - Reload/Swap Left Weapon

Y - Swap Weapons

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Trigger - Use Right Weapon

Left Trigger - Use Left Weapon

Up on Directional Pad - Use Equipment

Right Bumper - Melee Attack

Left Bumper - Team Chat

 This has very similar advantages to Bumper Jumper except you can aim while deploying equipment but not while jumping, and it is much more convenient to communicate with your team as you can continue walking and aiming while you switch into your team chat.

Please note that it is not possible to aim while jumping without use of the "claw grip." Theater (mode) A - Play/Pause

B - Hide/Show HUD

X - Hide/Show Control Pad

Y - Flying Cam/Player Cam

Left Analog - Movement

Left Analog Click - Pan

Right Analog - Camera

Right Trigger - Slow Motion/Fast Forward

Left Trigger - Thrust

Directional Pad - Switch Player

Right Bumper - Move Up

Left Bumper - Move Down Forge (mode) A - Pick up/ Drop Item

B - Hold to Drop Item

X - Inventory/Item Options

Y - Delete Item

Left Analog - Move/Rotate Selected Item

Right Analog - Look/Rotate Selected Item

Right Trigger - Hold to Rotate Selected Item

Left Trigger - Thrust

Directional Pad - Play/ Edit Mode

Right Bumper - Move Up

Left Bumper - Move Down

Halo 3: ODST
The controls in Halo 3: ODST are largely the same as in Halo 3, except the "Back" button accesses the VISR Database, the X button activates VISR Mode, and D-pad "up" views waypoints.

Halo Wars
A - Press to select/Hold to select with "paintbrush" tool

B - Cancel selection

X - Move/Gather/Primary attack

Y - Special/Secondary attack

Left Analog - Move crosshair

Right Analog - Camera

Right Trigger - Cycle through selection

Left Trigger - Hold to speed up camera

"Back" Button" - Objectives

"Start" Button" - Pause

Up on D-pad - Leader abilities menu

Down on D-pad - Move/cycle to next army

Right on D-pad - Move to last alert location

Left on D-pad - Move/cycle to base locations

Right Bumper - Select local units

Left Bumper - Select global units

Halo: Reach
Default A - Jump

B - Switch Grenades

X - Action/Reload

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Analog - Aiming

Right Trigger - Use Weapon

Left Trigger - Use Grenades

Right Bumper - Melee Attack

Left Bumper - Use Equipment

↑ D-Pad - Team Chat

↓ D-Pad - Open Mic/Regoup

← D-Pad - Night Vision

Southpaw A - Jump

B - Switch Grenades

X - Action/Reload

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Analog - Aiming

Right Trigger - Use Grenades

Left Trigger - Use Weapon

Right Bumper - Use Equipment

Left Bumper - Melee Attack

↑ D-Pad - Team Chat

↓ D-Pad - Open Mic/Regoup

← D-Pad - Night Vision

Boxer A - Jump

B - Switch Grenades

X - Action/Reload

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Analog - Aiming

Right Trigger - Use Weapon

Left Trigger - Melee Attack

Right Bumper - Use Grenades

Left Bumper - Use Equipment

↑ D-Pad - Team Chat

↓ D-Pad - Open Mic/Regoup

← D-Pad - Night Vision

Green Thumb A - Jump

B - Switch Grenades

X - Action/Reload

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Melee Attack

Right Analog - Aiming

Right Trigger - Use Weapon

Left Trigger - Use Grenades

Right Bumper - Zoom View

Left Bumper - Use Equipment

↑ D-Pad - Team Chat

↓ D-Pad - Open Mic/Regoup

← D-Pad - Night Vision

Bumper Jumper A - Switch Grenades

B - Action/Reload

X - Use Equipment

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Analog - Aiming

Right Trigger - Use Weapon

Left Trigger - Use Grenades

Right Bumper - Melee Attack

Left Bumper - Jump

↑ D-Pad - Team Chat

↓ D-Pad - Open Mic/Regoup

← D-Pad - Night Vision

Recon A - Jump

B - Melee Attack

X - Switch Grenades

Y - Swap Weapons

Left Analog - Movement

Left Analog Click - Crouch

Right Analog Click - Zoom View

Right Analog - Aiming

Right Trigger - Use Weapon

Left Trigger - Use Grenades

Right Bumper - Action/Reload

Left Bumper - Use Equipment

↑ D-Pad - Team Chat

↓ D-Pad - Open Mic/Regoup

← D-Pad - Night Vision

Theater (mode) A - Play/Pause

B - Toggle HUD

X - Invoke Controls

Y - Change Camera Type

Left Analog - Movement

Left Analog Click - Change Follow View

Right Analog Click - Camera View

Right Analog - Aiming

Right Trigger - Adjust Playback Speed

Left Trigger - Camera Boost

Right Bumper - Fly Up

Left Bumper - Fly Down

↑/↓ D-Pad - Change Player

→ D-Pad - Skip Forward

← D-Pad - Skip Back

Forge (mode) A - Drop/Pick Up

B - Tools

X - Object Options

Y - Delete

Left Analog - Move

Right Analog Click - Zoom View

Right Analog - Pivot

Right Trigger + Right Analog - Rotate

Right Trigger + Left Analog - Push/Rotate

Left Trigger + Left Analog - Thrust

Right Bumper - Fly Up

Left Bumper - Fly Down

↑ D-Pad - Play/Edit

Halo: Combat Evolved Anniversary
Default A - Jump B - Switch Grenades X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Use Grenades Right Bumper - Melee Left Bumper - Flashlight Back - Toggle Visuals Southpaw A - Jump B - Melee X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Use Grenades Left Trigger - Fire Right Bumper - Switch Grenades Left Bumper - Flashlight Back - Toggle Visuals Jumpy A - Use Grenades B - Melee X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Jump Right Bumper - Flashlight Left Bumper - Switch Grenades Back - Toggle Visuals Bumper Jumper A - Switch Grenades B - Action/Reload X - Flashlight Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Use Grenades Right Bumper - Melee Left Bumper - Jump Back - Toggle Visuals Boxer A - Jump B - Switch Grenades X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Melee Right Bumper - Use Grenades Left Bumper - Flashlight Back - Toggle Visuals Green Thumb A - Jump B - Switch Grenades X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Melee Right Analog - Look Right Trigger - Fire Left Trigger - Use Grenades Right Bumper - Zoom Left Bumper - Flashlight Back - Toggle Visuals The Duke A - Jump B - Melee X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Use Grenades Right Bumper - Flashlight Left Bumper - Switch Grenades Back - Toggle Visuals Hero A - Jump B - Melee X - Flashlight Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Use Grenades Right Bumper - Action/Reload Left Bumper - Switch Grenades Back - Toggle Visuals Recon A - Jump B - Melee X - Switch Grenades Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Left Trigger - Use Grenades Right Bumper - Action/Reload Left Bumper - Flashlight Back - Toggle Visuals

Halo 4
Default A - Jump B - Crouch X - Action/Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Right Bumper - Melee Left Bumper - Use Armor Ability ←/→ D-Pad - Switch Grenade Boxer A - Jump B - Sprint X - Action/Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Melee Attacks Right Bumper - Throw Grenade Left Bumper - Use Armor Ability ←/→ D-Pad - Switch Grenade Bumper Jumper A - Sprint B - Action/Reload X - Use Armor Ability Y - Switch Weapons Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Right Bumper - Melee Attack Left Bumper - Jump ←/→ D-Pad - Switch Grenade Fishstick A - Jump B - Crouch X - Action/Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint Right Analog Click - Melee Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Zoom Right Bumper - Throw Grenade Left Bumper - Use Armor Ability ←/→ D-Pad - Switch Grenade Green Thumb A - Jump B - Crouch X - Action/Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint Right Analog Click - Melee Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Right Bumper - Zoom Left Bumper - Use Armor Ability ←/→ D-Pad - Switch Grenade Recon A - Jump B - Melee X - Sprint Y - Switch Weapons Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Right Bumper - Action/Reload Left Bumper - Use Armor Ability ←/→ D-Pad - Switch Grenade Southpaw A - Jump B - Crouch X - Action/Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint Right Analog Click - Zoom Right Analog - Look Right Trigger - Throw Grenade Left Trigger - Fire Weapon Right Bumper - Use Armor Ability Left Bumper - Melee ←/→ D-Pad - Switch Grenade

Halo: Spartan Assault
B - Switch Grenade X - Action Y - Switch Weapons Left Analog - Movement Right Analog - Look Right Trigger - Throw Grenade Left Trigger - Fire Weapon Right Bumper - Melee Left Bumper - Use Armor Ability

Halo: The Master Chief Collection
In addition to the specific control schemes of each individual game in the collection, The Master Chief Collection features several "Universal" control setups that span all four games.

Default (Halo 2) A - Jump B - Melee X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Use Right Weapon Left Trigger - Throw Grenade/Use Left Weapon Left Bumper - Flashlight Right Bumper - Switch Grenades Universal Default (Recon) A - Jump B - Melee X - Flashlight Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Use Right Weapon Left Trigger - Throw Grenade/Use Left Weapon Right Bumper - Action/Reload ←/→ D-Pad - Switch Grenade ↑ D-Pad - Flashlight Universal Reclaimer A - Jump B - Crouch X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Use Right Weapon Left Trigger - Throw Grenade/Use Left Weapon Right Bumper - Melee ←/→ D-Pad - Switch Grenade ↑ D-Pad - Flashlight Universal Zoom and Shoot A - Jump B - Crouch X - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Melee Right Analog - Look Right Trigger - Use Right Weapon Left Trigger - Zoom/Use Left Weapon Right Bumper - Throw Grenade ←/→ D-Pad - Switch Grenade ↑ D-Pad - Flashlight Universal Bump and Jump A - Swap Left Weapon B - Action/Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Zoom Right Analog - Look Right Trigger - Use Right Weapon Left Trigger - Throw Grenade/Use Left Weapon Right Bumper - Melee Left Bumper - Jump ←/→ D-Pad - Switch Grenade ↑ D-Pad - Flashlight Universal Green Fingers A - Jump B - Crouch X - Action/Reload Right Weapon Y - Change Weapon Left Analog - Movement Left Analog Click - Crouch Right Analog Click - Melee Right Analog - Look Right Trigger - Use Right Weapon Left Trigger - Throw Grenade Right Bumper - Zoom ←/→ D-Pad - Switch Grenade

Halo 5: Guardians
Default A - Jump & Clamber B - Thruster Pack X - Action & Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Sprint & Zoom Right Analog Click - Crouch & Ground Pound (HOLD) Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Smart-Link Left Bumper - Throw Grenade Right Bumper - Melee Attack & Spartan Charge Southpaw A - Jump & Clamber B - Crouch & Ground Pound (HOLD) X - Action & Reload Y - Change Weapon Left Analog - Movement Left Analog Click - Sprint Right Analog Click - Smart-Link & Zoom Right Analog - Look Right Trigger - Throw Grenade Left Trigger - Fire Weapon Left Bumper - Melee Attack & Spartan Charge Right Bumper - Thruster Pack Boxer A - Jump & Clamber B - Sprint X - Action & Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Crouch & Ground Pound (HOLD) Right Analog Click - Smart-Link & Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Melee Attack & Spartan Charge Left Bumper - Thruster Pack Right Bumper - Throw Grenade Green Thumb A - Jump & Clamber B - Crouch & Ground Pound (HOLD) X - Action & Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint & Zoom Right Analog Click - Melee Attack & Spartan Charge Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Smart-Link Left Bumper - Throw Grenade Right Bumper - Thruster Pack Bumper Jumper A - Sprint B - Action & Reload X - Thruster Pack Y - Switch Weapons Left Analog - Movement Left Analog Click - Crouch & Ground Pound (HOLD) Right Analog Click - Smart-Link & Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Left Bumper - Jump & Clamber Right Bumper - Melee Attack & Spartan Charge

Recon A - Jump & Clamber B - Melee Attack & Spartan Charge X - Sprint Y - Switch Weapons Left Analog - Movement Left Analog Click - Crouch & Ground Pound (HOLD) Right Analog Click - Smart-Link & Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Left Bumper - Thruster Pack Right Bumper - Action & Reload Fishstick A - Jump & Clamber B - Crouch & Ground Pound (HOLD) X - Action & Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint & Zoom Right Analog Click - Melee Attack & Spartan Charge Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Smart-Link Left Bumper - Thruster Pack Right Bumper - Throw Grenade Halo 4 A - Jump & Clamber B - Crouch & Ground Pound (HOLD) X - Action & Reload Y - Switch Weapons Left Analog - Movement Left Analog Click - Sprint Right Analog Click - Smart-Link & Zoom Right Analog - Look Right Trigger - Fire Weapon Left Trigger - Throw Grenade Left Bumper - Thruster Pack Right Bumper - Melee Attack & Spartan Charge

Alert carry
Alert carry is a feature introduced in Halo 2 for machinima purposes. The feature can be accessed by pressing "down" on the D-pad (Halo 2 only) or using a combination of buttons (Halo 3 and subsequent games).

Trivia

 * The Duke button layout from Halo: Combat Evolved Anniversary, which mimics that of Halo: Combat Evolved, is named in reference to the first version of the Xbox Controller. The unwieldy "Duke" was soon replaced with the more ergonomic "Controller S".
 * The Fishstick control scheme from Halo 4 is nearly identical to the default controller layout for the Call of Duty series. The layout's name is a play on the series' CoD abbreviation: cod is a species of fish.