What's a word that suggests having very long ears?

Solution 1:

I believe you're looking for macrotous.

Solution 2:

You should probably just go with "long-eared" — I don't think there are any specific terms meaning that, except possibly scientific ones with Latin roots.

Solution 3:

Huh, you might say the animals have pendulous ears. That emphasizes the weight of the ears, as well as suggesting they hang in a droopy fashion.

Two super cute bunnies in a basket