my animal behavior professor just emailed me this
Tag: axolotls
Anyone who has ever owned an axolotl can tell you that they are voracious eaters! Axolotls in the wild eat worms, insects, and small fish, sniffing out their prey and sucking it into their mouths along with anything in the surrounding water. This is why pet axolotls should never be kept on gravel; it is far too easy for the animal to suck up small stones and accidentally swallow them.
However, one of the problems facing wild axolotls is starvation. Introduced species of predatory fish such as tilapia and carp eat the same things as axolotls, and are rapidly out-competing the little amphibians. To add insult to injury, these fish will also feed on juvenile axolotls, as well as their eggs.