TV's Frink said: Probably something about people who hunt but oppose any kind of abortion in any situation, but I don't remember now.

Just to be clear, I don't hunt.

As for those that do, their rational is probably this:

human > deer

human embryo = human fetus = human

therefore:

human embryo > deer

human fetus > deer

therefore:

it is ok to hunt deer, but not abort human fetuses or human embryos.

Just to play devils advocate:

those that hunt might question the logic of those that complain about those that hunt and yet have no problem eating meat.