from the video :
"Creating some blue pigment out of the blue should have required inventing new chemistry and there was no way to just add that recipe to their genes. It was much easier for evolution to change the shape of their bodies ever so slightly at the microscopic level and create blue using physics instead. They solved a biology problem with engineering. "
Didn't they solve a biology problem with biology? Was it even a problem? Engineering is the application of knowledge to the design of something. Engineering isn't the best word to describe a mutation that continues due to natural selection by the collective result of the unorganized actions of multitudes of the birds in questions and predators of those birds.
One of my pet peeves is people ascribing agency to evolution as if evolution has a master plan (while sitting on a cloud with a lightning bolt in hand).
|Pictured : Evolution sitting on his throne in the clouds with lightning bolts in one hand considering how to engineer blue for the bird's feathers.