Thorn beast

Thorn Beasts are used as food by the Covenant, and Jiralhanae in particular. They are docile herd animals. Their neck and head contain a high concentration of neurotoxins. It is unknown what causes this or what function it has for the animal.

Because they serve as food, it is a possibility that they were kept at the agricultural ship Infinite Succor. Perhaps they were the animals seen by Rtas 'Vadumee's unit as infected by the Flood. However, this is only speculation.