On Throw Back Thursday:
Some mammals are as big as whales and elephants. Why are there no enormous birds?
Find out why in this 2009 article:
What Limits The Size of Flying Birds?
(photo by JJ Harrison via Wikimedia Commons)
On Throw Back Thursday:
Some mammals are as big as whales and elephants. Why are there no enormous birds?
Find out why in this 2009 article:
What Limits The Size of Flying Birds?
(photo by JJ Harrison via Wikimedia Commons)