Animal respawn rate

[Jammet]

Is there a way in which I can influence the animal population on my server?

Overnight a huge percentage of all animals as somehow switched species, and now we have wolfs everywhere. Interestingly, none of the chickens in my farm changed.

However, instead of running around in creative mode and throwing eggs, which is sorta a job for life, is there a command or a script that spawns random animals in all chunks or randomizes the species of the ones already there?

[Jammet]

This wolf problem is getting overboard. There were like, 50 wolfs spawned in the river (why do all these animals go or spawn at rivers and stay there forever?).

I had to disable the wolf entirely for now. Will check next version if they cut it out, because if I do, they grow right back.