RE: "I feel like I should find them a home."
You're almost right. You should've said, "I feel like I should find *him* a home."
Been there, done that. Take the word of an older woman (and psychologist), if he's this grumpy at this age about spending extra time and money over keeping some helpless baby chicks safe, a future with him doesn't look promising. Especially since I'm assuming some of this money is yours, too. Unfortunately, curmudgeons do NOT improve with age. It also sounds like he might be narcissistic (my absolute favorite!)
As they say, the best way to find out if a person is worth spending a lifetime with, is to see how they react in a crisis situation. This isn't even a crisis and he's acting badly. Some things are best found out early.
He's not the only man on the planet. Find one that's more sympathetic to helpless animals (like all the guys on this site), and you'll have found a good man with a kind heart. One worth spending a lifetime with.