Are hybrids sterile?

[pdomensis]

Good question. The problem is that for years we've learned in biology class that a species is a group that can breed and produce fertile offspring and that critters not in the same species can't do that. While this holds true for a lot of things there are a number of examples of cross-species and even cross-genus hybrids out in the real world (and on the market). Some times the animals are "breaking the rules" and sometimes we just don't know enough about the relationships to correctly define a "species". While NBLADE is correct in that most hybrids on the market are fertile, that doesn't mean you can breed more distant relatives, say boids and colubrids and expect fertile offspring-much to my disappointment.

Anyone interested in a retic/milksnake?