Intriguing research indicates that penguins (and perhaps other seabirds) 
seem to use odors to recognize family members and other familiar birds:

http://esciencenews.com/articles/2011/09/21/smells.may.help.birds.find.their.homes.avoid.inbreeding


Janet Millenson
Potomac, MD (Montgomery County)
 <mailto:[log in to unmask]>
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"Look at the birds!" -- Pascal the parrot


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