All wild animals (as lions, tigers, snakes, crocodiles, ... etc) and evil people and or enemies.
No, Destroy All Creatures does not kill indestructible creatures. Indestructible creatures cannot be destroyed by effects that say "destroy."
Rabbits.
The answer is yes.
Leprechauns are mythological creatures. Since they do not exist, they can not kill.
No, you can only kill living creatures, Mermaids are imaginary.
Probably Chavs.
werewolves
Kill creatures, they drop them rarely.
People kill domestic pigs for food.
Scorpion
Most living creatures need a home of some sort.
Cnideria is a major phylum (a sort of category) of animals that includes jellyfish-like creatures.