Only one dominant one will crow but around 6 months one of your roosters should crow look for spurs on there feet and combs on there heads

Not as far as I know dog are just like humans actually all animals are its just colour

I have a few that I need 2 sell

Its like adoption like take A rat if she has babys and wont take care of them then if you have another 1 and she is feeding then you can give her the other females babys and she can feed them