3 ms·
A reminder of just how far back in genetic history birds and mammals went separate ways. Another being that birds have no X or Y chromosomes -- their genetic ma
by everybodyknows 3y ago
A reminder of just how far back in genetic history birds and mammals went separate ways. Another being that birds have no X or Y chromosomes -- their genetic machinery for sex is very different from ours.
- NooneAtAll3 3y agosome birds have X and Z and 2 of the same shape in the males, while females have different
- wnoise 3y agoW and Z.
- ordu 3y agoAnd no neocortex. Smart birds like ravens rely on a traditional system of ganglia to be smart, not on that hyped six-layered neocortex covering most of the brain.