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Birds don't have a great sense of smell. It seems to be a myth that birds don't care for their young after being touched by humans.

https://www.thespruce.com/birds-five-senses-386441

Interesting.

Not always - I put some birds back in the nest with my gloves and they were fine - I will not be able to just leave it

I didn't know that gloves would work. I'll certainly try then if I have the opportunity to save one. Thanks for the advice!