They lie to us! Those well meaning parents and friends that tell us how much fun they had taking their kids to the Zoo! It is not fun carting them around miles of other kids to see sleeping animals and empty cages. It is not fun to pay 50C for handfuls of dog food so they can risk life and limb dangling over rotting railings to throw it away at giant fish and noisy geese and ducks.
It is, however, a time honored tradition. They do seem to enjoy it for a little while. And it's great for your calves! So we do it, if only to brag to others that we survived the Zoo trip.