[va-richmond-general] Re: 90% of trees
- From: "Dummitt, Pam" <pam.dummitt@xxxxxxxxxxxxxx>
- To: "'va-richmond-general@xxxxxxxxxxxxx'" <va-richmond-general@xxxxxxxxxxxxx>
- Date: Thu, 30 May 2002 09:08:33 -0400
Canada Goose
-----Original Message-----
From: Lewis Barnett [mailto:blbarnet@xxxxxxxx]
Sent: Wednesday, May 29, 2002 9:32 PM
To: Richmond Audubon Society
Subject: [va-richmond-general] 90% of trees
I was chatting with a colleague at work a few days ago about
things outdoors. He's an avid hiker, and has recently taken
up tree identification. He said that he had observed that
there were about five species of trees that accounted for
about 90% of the examples you see in our area. He posed the
following question: how many species of birds would you
need to be able to identify in order to know 90% of the
birds you normally run across around here.
My initial guess was about 10. But I think I might have
been a bit low. Here's my list, in no particular order:
Rock Dove
Mourning Dove
Starling
House Sparrow
Cardinal
Blue Jay
Mallard
Chickadee
Titmouse
House Finch
In retrospect, I think you may need 15 or 20 to do the job,
but I have no data to back this up. I limited myself to
thinking about birds that are here year-round or that nest
here, but you could play the game with looser rules.
Anyway, it was a fun question to think about...
Lewis Barnett
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