Shake Your Silk-Maker: The Dance of the Peacock Spider

With their ornately-colored bodies, rhythmic pulsations, and booty-shaking dance moves, male peacock spiders attract the attention of spectating females as well as researchers. One such animal behavior specialist, Madeline Girard, collected more than 30 different peacock spider species from the wilds of Australia and brought them back to her lab at UC Berkeley. Under controlled conditions, she recorded their unique dances in the hopes of deciphering what these displays actual say to a female spider and how standards differ between species.
All lab spider footage ©Madeline Girard



World with solar panels

Planetary orbits are the result of the interplay between angular momentum (velocity), distance between the two bodies, and gravity. The time taken to complete an orbit is known as the planet’s period of revolution or year; the greater the distance between the planet and its sun, the greater the period of revolution.  The mass of the planet and the mass of the sun will also affect the period; the greater the mass of the sun, the faster the period of revolution.

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