London Bridge is Covered in Animals.

...Or, The Things I Think About While Waiting for the Bus.

All of these can be sung (more or less) to the tune of "London Bridge".

Oviparous animals, animals, animals
Oviparous animals
Hatch from eggs.

Snails, snakes, and dinosaurs,
Chickens and frogs,
Ants and isopods,
All are oviparous,
And hatch from eggs.

Viviparous animals, animals, animals
Viviparous animals
Are Born Alive.

Cats, Dogs, and Grizzly Bears,
Monkeys and Mice,
Elephants and horses,
All are viviparous
And are born alive.

ALTERNATE (substitute in animal/genus in question)

We are viviparous, viviparous, viviparous
People are viviparous
We are born alive.

Amphibians are oviparous, oviparous, oviparous
Amphibians are oviparous
They hatch from eggs.

Mammals are viviparous, viviparous, viviparous
Mammals are viviparous,
Except platypi and echidnas.

EVEN MORE ALTERNATES:

Snakes and lizards and dinosaurs,
They are reptiles and hatch from eggs
Snakes and lizards and dinosaurs,
Reptiles are oviparous.

Dogs and Cats and Chimpanzees,
They are mammals and are born alive
Dogs and Cats and Chimpanzees,
Mammals are viviparous.