[TheKhanzumer]

Mudokons are a superspecies, they have a "queen" which asexually produces the many eggs that make up the mudokon race. We don't know what happens when a queen dies but my guess is that the old one lays a new one well ahead of time just to be safe.

Glukkons are the same as mudokons (reproductively speaking) except they give birth to live young.

Sligs also have a queen. We don't know if they are born live or in eggs but they do have a "larval" stage.

Vykkers are hermaphrodites born fertile. They can have babies whenever and wherever they feel like it.

Slogs have a queen.

Gabbits reproduce sexually. They have special spawning locations like salmon.

Scrabs probably produce sexually and have a mating system like lions. One male (the Alfa) and a bunch of females that follow him around.

Fleeches were created by Vykkers. I have no idea how they reproduce in the wild.

I don't know how elums, meeches, paramites, shrykulls, slurgs, fuzzles, meeps, bats, bees, worryfish, birds or interns reproduce (although I have some good guesses).

I hope that helps and I hope I didn't miss anything!

Edit: Oops I did miss some. Rats, fireflies and elderlings as well as many creatures that have not yet appeared in any games. I don't know how they reproduce.