The groove billed ani is a member of the cuckoo family. Cuckoos are distinct because they have two toes that point forward and two that point back (unlike the more common bird foot, three forward and one back.)
I didn't know it was a type of cuckoo when I drew it. But I thought that big hooked bill made it look kind of menacing, like a raven or other scavenger. So I picked this background to go with that mood. Ominous.