From Halopedia, the Halo wiki
Kuscatu are a type of creature indigenous to Sanghelios.
Kuscatu, like colo, are raised by Sangheili to be butchered and eaten. Following their victory over the Covenant in October 2558, the Swords of Sanghelios in Nuusra with the Arbiter prepared kuscatu and colo to celebrate. Spartan Edward Buck, present for the celebration, thought the meat tasted delicious.