Ate the heads completely. When a GHO kills a cottontail it starts eating from the head backwards - eating everything it is able to consume. They will then generally 'hide' the rest of the rabbit so that the crows or vultures don't eat it. In cool weather through winter they will return to the kill the next night and finish their meal. They will not return to a kill once it spoils - unlike redtails who will even eat carrion. If you ever have a chance to dissect the 'barf pellets' of a GHO you will find bones, teeth, skulls and hair of their prey.