For the past several weeks we have been watching a pair of nesting red-tailed hawks across the canyon. They built a nest in a eucalyptus tree, then the female began incubating a clutch of eggs. The male would bring her food and spell for short stints on the nest, while we spied on them through…
Day: April 13, 2015
Symmetries I
As a long-time student of invertebrate zoology I have for most of my life appreciated the immense variety and ingenuity of animal body plans. And one of the things I’ve always found the most intriguing is the pentaradial symmetry of echinoderms. I remember thinking, the first time I encountered a live echinoderm (probably a star at the…