> Could be simply a case of more pairs of eyes, more likelihood that albinos
> are going to be seen. I'm sure that most urban areas are regularly patrolled
> by Sharpies, Coops, etc, though obviously unlikely in the same numbers as more
> rural habitats.

I agree with you that urban areas are patrolled by Hawks.

> ... . I know of one study in the Keilder Forest in northern
> England that was radio tracking various sizes of songbirds - within 2 weeks
> Sparrowhawk (latinus haventaclueus) had eaten every one.

As a favor to you, I will "haveaclueus" : _Accipiter nisus_

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A bird in the bush is better than two in the hand.

Serge Le Huitouze Intelligent Software Group
email: serge at cs.sfu.ca School of Computing Science
tel: (604) 291-5423 Simon Fraser University
fax: (604) 291-3045 Burnaby, B.C., V5A 1S6 CANADA