“As terrifying as the thought of a gigantic snake might be,
or as precious as the thought of a football-size horse might be, don't go
looking for them any time soon. These changes take centuries, not years. But
you might want to leave your great-great-grandchildren a heads-up note, just in
case.”
And so ends a pretty informative article on the relative
size of animals as a response to environmental temperature. Warmer favors
larger reptiles and smaller mammals and the converse for cooler. So far so
good.
Then, is a classic case of total misunderstanding of the
evolutionary process, the author makes the classic blunder: “- - - - centuries,
not years.” The process would actually take millennia at the least, and more
likely millions of years to actually come up with snakes the size of school
buses and horses the size of small dogs. But wait, don’t we have mini-horses
and gigantic anacondas already? Yup. And the anacondas live in tropical places
and the horses live in apartments. How long did it take to get these out sized
animals? Millions of years in the case of the snake, and dozens in the case of
the miniequines. Problem is that snakes are already at the limit of their size
or they would be bigger, and the horses are classic inbred freaks who wouldn’t
last 10 minutes in nature.
So don’t worry. No bus-sized snakes for your grand kids or
mouse-sized cattle either. Evolution takes longer than that, and besides, the
conservatives assure me that there is no such thing as climate change.
Image and quote: http://news.yahoo.com/a-snake-the-size-of-a-school-bus--it-happened-before--and-could-happen-again-153534343.html