One, on NPR's Morning Edition, explains how fish are able to efficiently
swim at high velocities by zig-zagging between eddies that form around
objects. Go here and click on "The Physics of Fish"
http://www.npr.org/rundowns/rundown.php?prgDate=28-Nov-2003&prgId=3
Another, in a recent Journal of Experimental Biology, describes how the
sailfin catfishes are able to reduce the size of their pupils in bright
light - and how it may function not only visually, but as camouflage.
http://jeb.biologists.org/cgi/content/full/205/22/3425
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