1. Pets: a cat, a dog, a bird, a rabbit, a frog, cats, dogs, birds, rabbits, frogs
2. Language:
There's a rabbit. I like rabbits. What do you like?
I like monkeys. I don't like lions.
3. Zoo animals: a monkey, a lion, a bear, a giraffe, an elephant, monkeys, lions, bears, giraffes, elephants