Craigslist has a good reputation. FreeCycle used to be good, 'til they got full of themselves with rules. They now have more 'dont's' than an airline checkpoint - one of which is no animal giveaways.
You might try learning a little Spanish and post an ad in the area free shopper, etc.....
GRATIS: Gallos/gallinos en ( - - your area - - ). Venga y ellos recoger. Llama ( - - your name - - ) a ( - - phone number - - ). Por Favor, no hablo Espanol.
"FREE: Roosters/cockerels in (your area). Come and pick them up. Call (you) at (number).
Please, I don't speak Spanish."
Works like a charm. When they call, they know you need them to speak in English, right away. 'Makes things easier.
This one is also along the lines of the Chinese suggestion earlier. If you're sensitive or prone to worry about their welfare, don't do it.