Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Category: bird 
Words: goose, hoist, neck, swallow, crane
hoist

Category: animal 
Words: flutter, fly, bats, eagle, pounce
flutter

Category: baby animals 
Words: kitten, fawn, hatchling, identity, doe

identity

