Thursday, March 12, 2009

The naughty dung beetle...

Among scarab beetles, males and females generally pair up to start a family, jointly gathering dung and rolling and patting it into the rich brood balls in which the female deposits her fertilized eggs. The male may on occasion try to attract an extra female or two — but he does so at his peril. In one experiment with postmatrimonial scarabs, the female beetle was kept tethered in the vicinity of her mate, who quickly seized the opportunity to pheromonally broadcast for fresh faces. Upon being released from bondage, the female dashed over and knocked the male flat on his back. “She’d roll him right into the ball of dung,” Dr. Barash said, “which seemed altogether appropriate.”

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