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Re: New refs (short)




Heinz Peter Bredow <HPB1956@aol.com>

In any case crocs are highly adapted to their semi-aquatic niche
including being ectothermic, semi sprawling and having a special blood
circulation system. IMHO they are as highly adapted to living in water as birds are adapted to flying.

There were terrestrial crocs too, now extinct.

Dinosaurs (as far as we know) never had to adjust to a semi-aquatic living.

One lineage managed quite well... :-) (quack quack)


2. The maximum size of mammals may be limited by the duration of gestation. The bigger a mammal the longer the gestation period and the lower the number of offspring at birth. Surpassing a certain size would have been kind of suicide for a species,

Whales?




Tim

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