How do birds know how to mate with the same type? eg: yellow finch to yellow finch, red to red, robin to robin

Answers:
They don't have a self-image (as far as we know).

Also you won't hear them saying well, "I am a robin, but the cardinals over there ..."

To answer your question, they songs and looks of their parents become inprinted on them in the nest. When they get old enough to mate, the song identifies one bird from the next.

However, hybrids and "dialects" of songs have been detected by ornithologists.

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Sorry don't know anything about birds but they sound really nice this time of year. Especially about 6am in the morning

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Like humans...they are more likely to be with someone that speaks a language they understand. Even different finches have their own certain calls. Plus, they can see and recognize their own kind.

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How do you know to have sex with a human? It's natural instinct.

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Yes, gotta agree with Niki on this one! HELLO!!
lulu