why, being a philosophical question, can not be answered by science. one could say "because that's how god made it" and another say "so we'll have lots to eat" or yet another "to protect its young". in the right contects each is perfectly correct
zaf
It walks on 2 legs. An ostrich runs at about 70km/h (45 mph)
the ostrich has long legs and stream like feathers
longer than yours!
Ostrich
An ostrich is unable to fly, but it has two long, every strong legs on which it can run fast on.
It could be an Ostrich, Emu or Flamingo. There are many birds with long legs.
ostrich
Ostrich is a bird, and it is the largest bird species in the world. They are flightless birds with long legs and necks.
Ostrich
An ostrich has two legs and two wings because it is a bird.
Yes, the ostrich is the fastest runner on two legs.
Their long legs give them a boost when running from predators.