Like humans the sex of the bird is determined by chromosomes. Unlike humans the male is the homozygous sex. Male birds have 2 Z chromosomes while female humans have 2 X chromosomes. The female bird has a ZW chromosome (while the male human has XY chromosomes). Just like humans the sex of the offspring has a 50% chance of being male and a 50% chance of being female. It sometimes may seem that birds are more often male because the males often have showier plumage than the females. The females often tend to not sing as much as the males. So the males are easier to find and see than the females but their sex ratio is still 50:50.
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