"I'm gonna say we've got at least a week or two before we have to worry about that."

Granted, he did specify the colors he did so that it would be more likely for the males to get picked off due to their higher visibility, thus allowing the females to have their pregnancies in peace while the Monument spawned replacement males...

[Of course, the Monument will prevent animal populations from becoming ridiculous, but I don't think that's been ICly brought up at any point.]