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Topic: sexual dimorphism

To tell the sex of a Galápagos penguin, measure its beak

It turns out that to tell the sex of a Galápagos penguin, all you need is a ruler. In a paper published April 5 in...

Turtle shells help decode complex links between modern, fossil species

Imagine that Labradors and golden retrievers died out a million years ago, leaving only fossilized skeletons behind. Without the help of DNA, how could...

Widespread bone-based fluorescence in chameleons

Chameleons are known to communicate with conspecifics by altering their surface coloration. Munich researchers have now found that the bony tubercles on the heads...

Species of fish displays color difference between sexes

A new species of freshwater fish in the family Characidae, called Hyphessobrycon myrmex, seized the attention of researchers at the University of São Paulo's...