Study: There Are Twice as Many Bird Species as Previously Estimated
The issue of biodiversity in all vertebrates was linked from ecological variation to nutrient energy-dependent ecological adaptation by natural selection for codon optimality and differences in morphology paired with differences in behavior in the context of the physiology of reproduction and biophysically constrained cell type differentiation.
See: Estrogen receptor α polymorphism in a species with alternative behavioral phenotypes
…our results illustrate a detailed chain of events linking a chromosomal rearrangement to changes in overt social behavior.
Thomas Hunt Morgan (1933-Medicine) and Schrodinger/Dirac (1933-Physics) collectively linked chromosomal rearrangements to all biophysically constrained biodiversity via their Nobel Prize-winning works.