Last week Miss C linked to a story about 9 bad animal mothers, but if you just can't get enough terrible critter parenting, then you might just enjoy this Cracked article with even more wretched mothers. For example, the Tasmanian devil that places its own form of natural selection on its own babies after giving birth to a litter of around 50 pups:
Because there are only four milk spigots, only four pups will survive. Plain and simple. As soon as they're born, there's a race to see who gets one of mommy's feeding nozzles. Whoever makes it there first and can hold on wins.
The rest simply don't survive, but believe it or not, they're only ranked #5 on the list of crummy critter moms.