Why do we never see 'mongrel' birds?
by Guardian Staff from Environment | The Guardian on (#150H3)
Readers answer other readers' questions on subjects ranging from trivial flights of fancy to profound scientific concepts
Why do we never see "mongrel" birds? Why does a blackbird never mate with a thrush or, especially, a hedge sparrow with a dunnock? I asked the Natural History Museum and they said that different species don't fancy each other - but that doesn't apply to dogs, and, given that there must be millions of bird matings each day, why has there never been a "mistake"?
Keith Good, Norwich
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