
Why do some mammals lay eggs?
The question of why some mammals lay eggs, among other questions, has been answered in a study in 2021 that looked at monotreme (egg-laying mammal) DNA. Researchers sequenced the genomes of platypuses (and echidnas) and compared them to that of chickens, humans, rats, Tasmanian devils, and lizards to “[improve] our understanding of how other mammals […]
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