[mou] Re: Pelican that is brown
Anthony X. Hertzel
axhertzel@sihope.com
Mon, 19 Apr 2004 09:36:04 -0500
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This is an American White Pelican that for some reason or another
apparently has had its feathers oiled or stained.
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I did some "back-or-the-envelope" calculations about this bird.
Notice that it appears smaller than the bird to its right. The Brown
Pelican should be smaller than the American White Pelican. Sibley
indicates sizes of
Brown Pelican 51 inches
American White Pelican 62 inches
Measurement from Jeff's picture indicate
Unknown Pelican 293 pixels
American White Pelican 414 pixels
Notice also that the Unknow Pelican is facing away from the camera.
Suppose that we assume that this is a Brown Pelican and solve for the
angle that the bird is facing away from the camera:
51 * cos(angle) / 61 = 293 / 414
The angle is 30 degrees, probably about how much the unknown pelican
is facing away from the perpendicular to camera-bird line.
This calculation would support the identification of Brown Pelican.
<http://biosci.umn.edu/~mou/temp/DSC00007.JPG>http://biosci.umn.edu/~mou/temp/DSC00007.JPG
Thanks.
---
David Cahlander <mailto:david@cahlander.com>david@cahlander.com
Burnsville, MN 952-894-5910
--
Anthony X. Hertzel -- axhertzel@sihope.com
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<div>This is an American White Pelican that for some reason or another
apparently has had its feathers oiled or stained.</div>
<div><br></div>
<div>------------</div>
<div><br></div>
<div>I did some "back-or-the-envelope" calculations about
this bird. Notice that it appears smaller than the bird to its
right. The Brown Pelican should be smaller than the American
White Pelican. Sibley indicates sizes of</div>
<div> </div>
<div> Brown
Pelican <span
></span> 51
inches</div>
<div> American White Pelican 62
inches</div>
<div> </div>
<div>Measurement from Jeff's picture indicate</div>
<div> </div>
<div> Unknown
Pelican <span
></span> 293 pixels</div>
<div> American White Pelican 414
pixels</div>
<div> </div>
<div>Notice also that the Unknow Pelican is facing away from the
camera.</div>
<div> </div>
<div>Suppose that we assume that this is a Brown Pelican and solve for
the angle that the bird is facing away from the camera:</div>
<div> </div>
<div> 51 * cos(angle) / 61 = 293 / 414</div>
<div> </div>
<div>The angle is 30 degrees, probably about how much the unknown
pelican is facing away from the perpendicular to camera-bird
line.</div>
<div> </div>
<div>This calculation would support the identification of Brown
Pelican.</div>
<div> </div>
<div><a
href="http://biosci.umn.edu/~mou/temp/DSC00007.JPG"
>http://biosci.umn.edu/~mou/temp/DSC00007.JPG</a></div>
<div> </div>
<div>Thanks.</div>
<div>---<br>
David Cahlander <a
href="mailto:david@cahlander.com">david@cahlander.com</a> Burnsville,
MN 952-894-5910</div>
<div><br></div>
<div><br></div>
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</pre></x-sigsep>
<div>Anthony X. Hertzel -- axhertzel@sihope.com</div>
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