There is a lovely African saying. It varies in the telling but it goes something like this:

Each morning in Africa a zebra wakes up and while brushing his teeth he thinks to himself – today I must run faster than the fastest lion if I am to survive.

Each morning in Africa a gazelle wakes up and while putting on his shoes he says to himself – today I must run faster than the fastest lion if I am to survive.

Each morning in Africa a lion wakes up and says to himself – today I must run faster than the slowest zebra or the slowest gazelle if I am to eat. 

There is such wonderful wisdom packed into this story. If Charles Darwin had been aware of this story would he have needed to travel on the HMS Beagle at all?