Re that pic a few posts ago, with the zebras and wildebeest: we are told there is a distinct symbiotic relationship between the two, which explains why they are so often seen together. The zebras have excellent eyesight but poorer smell/hearing, and the wildebeest have exactly the opposite - so by pairing up in numbers, they increase their collective ability to sense when danger is near. Also, zebras tend to feed on the tallest grass, allowing the wildebeest to feed more easily on their preference, which is the shorter stuff underneath. Mother Nature rules.