Answer:
Because the preds always go after its most preferred prey, for example, a rabbit will want a carrot or celery because it's more preferred and yummy than just eating grass
Another example is sharks. They'll will eat fish over humans but if they're really starving, they will take the extra steps and just eat a human ♀️
Step-by-step explanation:
It's really just about preference if something you really like is all gone, you'll take the next best thing. Just life tbh