A whale in the seas
Had boney maroney knees,
But he glided along
Hearing a morning song...

Coming from the beach
That he couldn't quite reach.
He tried a million years
Despite Cetacean jeers!

But his little, bitty son
Definitively won...
Flippered with alacrity...
Day after year with tenacity.

One dawn, a goodly thrust
Sent this younster, with crust!
Up on the beach...loud elation!
'Come on pop! You'll like
Being a
Crustacean!

elysabeth faslund

http://www.poemhunter.com/poem/evolution-19/