How Bar-Headed Geese Scale the Himalayas: Scientific American
Please read the above links about Bar-headed Geese and their amazing feat to migrate over the Himalayas.
Few clips from these articles pasted below.
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Body heat
How do bar-headed geese stay warm during their cold flight through the Himalayas? The ceaseless exertion required of Himalayan crossings produces prodigious amounts of body heat. Helping the bar-headed goose to retain this body heat is an inner layer of highly insulating down feathers, and an outer layer of tightly woven waterproofing feathers that prevents body ice from accumulating, weighing the bird down and plunging it to its death.
The bar-headed geese’s weapons against low-oxygen air also include their hemoglobin (a protein contained in red blood cells that binds oxygen molecules), which grabs oxygen particularly effectively at high altitudes, and thereby enables the birds to extract more oxygen from each breath of air than can other birds.Once the bar-headed goose’s blood is stoked with oxygen, it rushes through capillaries that are especially densely distributed in these birds’ muscles.
Dear SS( Sincere Seeker):
After reading the above articles, could you then tell me how the bar-headed geese developed or evolved inner layer of highly insulating down feathers, and an outer layer of tightly woven waterproofing feathers( without that, the icy accumulations would weigh the bird down and plunge it to its death.) if they were not originally equipped to start their migration over the Himalayas? And how did they develop or evolve their special kind of hemoglobin (a protein contained in red blood cells that binds oxygen molecules), which grabs oxygen particularly effectively at high altitudes? IF they don't have these kind of special hemoglobin to start with, they won't be able to survive in the high attitudes' low oxygen level. They couldn't survive evolving their hemoglobin gradually, little by little, right? Tell me how do these geese develop or evolve capillaries that are especially densely distributed in their muscles?
Don't tell me the magic word " Evolution" and it will do all these tricks.
Isn't it more sensible and logical to assume that they were designed that way from the very beginning of their species, smart you?
