Covenant scavenger craft

The Covenant Scavenger Craft was a ship that was mentioned in Halo: First Strike.

Purpose
They were used to push debris into a concentrated region of space over Reach's northern pole. They were described to have long grappling tentacles for dragging sections of salvaged metal.

Trivia

 * They are the only known ships to have tentacles.
 * They may have some resemblance to the Engineer.
 * According to Cortana, there were 217 Scavenger Craft present at Reach.