When some new sea lions arrive at the park, Mr Hammond decides to go swimming with them during feeding time. The only problem is, Andy and Jen don't yet know how many anchovies, a type of fish, the sea lions like to eat in a day. Too many could make them ill, too few and they'd be hungry. To find the answer, Andy jets off in his safari-mobile to the coast of Argentina in South America in search of some sea lions feeding. Along the way, he meets an enormous elephant seal, so called because the males have a nose that looks a bit like an elephant's trunk. After a harrowing chase between two rival males, Andy finds the sea lions and eventually takes to the water to watch them hunt. But how will he count all the fish the sea lions are eating, and will Andy make it back to Safari World in time with the answer?