At the opening of Safari World's new Galapagos dome, Andy finds that he can't answer a question about sea lions. So he travels across the world in his safari sub to find out how they deal with flies.

After Safari World's wood duck chicks get stuck in a hole halfway up a tall tree, Andy travels to North America to see how they deal with such a problem in the wild. Andy makes a surprising discovery about wood ducks.

When Andy inadvertently destroys some special, nutrient-rich mud for Safari World's new mudskippers, he has to find some more to replace it. He heads to Japan, where he encounters jumping mudskippers and a hidden egg burrow.

Mr Hammond is keen to impress his brother, sea-life expert Professor Hammond, with an undersea fact. So Andy helps out by investigating where the sea kraits of Niue Island lay their eggs.

Mr Hammond tries to take a picture of a blue whale, but gets too close - all that can be seen is a patch of blue! Andy heads to the Atlantic Ocean in his safari sub, learning all about the blue whale and its immense size.