Now consider a sea turtle, swimming in the sea.

A sea turtle swims over a reef. Its head and legs are covered in scales.

The sea turtle has scaly skin on its head and legs, and a hard shell.

Out of the water its skin is dry, never slimy.

At night, the sea turtle comes up the beach.

A sea turtle lays its eggs in a hole in the sand.

It lays its eggs on land, in the sand.

So the sea turtle is a reptile.

The sea turtle: dry, scaly skin, yes. Eggs on land, yes. It is a reptile.

Now consider a salmon, swimming in the same sea.

A salmon. Its skin is wet and slimy.

The salmon's skin is wet and slimy.

The salmon lays its eggs in the water.

So the salmon is not a reptile.

The salmon: dry, scaly skin, no. Eggs on land, no. It is not a reptile.