|
Hi!
I tried to find some information of the BCF
hypothesis from the internet, and found the following address:
There is a text. It says:
"A sprawling diapsid such as
Mesenosaurus effectively becomes an upright animal when climbing a tree
and will suffer a momentary disadvantage until its blood pressure is able to
partly compensate for the change. Any adaptation, such as a four-chambered
heart, that removes this disadvantage will enable the animal to climb faster and
easier and escape from a predator more
effectively."
Why should an erect stance be an adaptation to
arboreal life? There are many, many climbing lizards today and I think all of
them sprawl. Well, there are chameleons, but then again, they have the usual
heart.
I don't think the logic here is good at all,
really. Is this really how the BCF goes?
Henri Rönkkö
|