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Questions tagged [scales]

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57
votes
4answers
13k views

How come large herbivores have such thin legs?

Edit: This question is very similar to this and related to this one (though the latter focuses on homology instead of scaling laws). However, the answer to this question is far more comprehensive, in ...
18
votes
2answers
1k views

Do the majority of fish lack scales on their heads?

Based on pictures, it seems to me that a vast majority of fish species that have scales do NOT have scales on their heads. Is that fact true? To make this properly answerable: lets' define a "...
9
votes
2answers
2k views

Did human hairs actually evolve from scales?

What is the evolution of hairs? Did they evolve from scales?
7
votes
2answers
1k views

What did pangolin scales evolve from?

Were they developed anew or a heritage from fish?
5
votes
2answers
5k views

Are fish and reptilian scales homologous?

Wikipedia: Fish scales are dermally derived, specifically in the mesoderm. This fact distinguishes them from reptile scales paleontologically. So aren't reptilia scales also dermally derived?
1
vote
1answer
290 views

Which Geologic time scale is the most accurate? [closed]

I kindly ask to show me some pictures that is a generally accurate geologic time scale. In google, a lot of geo time scales are different. On what i have searched there are 2 major eons which are ...
0
votes
0answers
13 views

What are the methods to measure the surface density of animals in biology?

In biology there is a rule found by Damuth (https://www.nature.com/articles/290699a0): a relationship between the size of an animal species $l$ and its local abundance (surface density) $N/S$ $$N/S=...