characteristics - a quality that belongs to and helps to identify a person or    thing

breed - a particular kind of plant or animal

warren - is an underground space that rabbits live in in a herd

burrow - a hole dug in the ground by an animal

litter box - a box used for cats and rabbits to go to the bathroom in

veterinarian - a doctor who treats animal

vaccinations - the liquid that contains the dead or weakened germs of a certain disease.  This liquid is injected into the body to help the body protect itself against the disease.

herbivore - an animal that eats only plants.