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They are bipedal, and posses a foramen magnum at the base of the skull; they also have a large intracranial space, comparable to ''Homo sapiens''. This, alongside a presumably well-developed cerebrum, gives them a high cognitive capacity.
Singers have orange blood.{{book ref|sa3|38}} They have greater resistance to cold temperatures than humans.{{book ref|sa4|102}}
=== Aging and Senescence ===
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