If the Alligator doesn't eat the bird the relationship would then be called?

A parasitism

B competition

C mutualism

D predation

E commensalism

It would be considered E

Since

Parasitism is when one be benifits at the others harm, normally has a host and parasite. Like a tic and dog. The tic is the parasite and the dog is the host

Competition is when two animals fight for prey, territory, or mates. Like when two male lions fight to prove strength and the winner leads the pack while the other is kicked out and must go find there own pack

Mutualism is is when two animals are counted as mutuals. Like the alpha male and female that believe they are equals

Predation is when one animal eats another it normally has a prey and a predator Like the cat and the mouse. The mouse is the prey and the cat is the predator

Commensalism two animals live peacefully in the same habitat. Like the cow and the cowbird both love in harmony