why rbc richest blood is found in birds?
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Answer - Red blood cells are richest blood found in blood because they eat worms and drink water..
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BECAUSE THEY ARE MAINLY WARM BLOODED
Nucleated red blood cells is a symplesiomorphy in this context. So the simplest answer is that their ancestors had them.
Of course this begs the question why mammals lost their nuclei. And we tell our students that it made the cells smaller, more flexible, and better at squeezing through capillaries.
But wouldn’t this have been good for all high metabolism creatures with capillaries? Perhaps so, but it may have required trade offs that birds could not accept: higher turnover of cells, more cell manufacture, more cell recycling. A bird physiologist could say more of on this.
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