Matt Rourke/AP
Pre-Easter eggs: Within hours of this photo, the female of this red-tailed hawk couple nesting on a ledge of the Franklin Institute in Philadelphia laid a third egg. The two seen here arrived days earlier, one on March 17 and the other on March 20./SeattlePI
Three-month-old twin polar bears Aleut and Gregor have made their first public appearance at Tiergarten Zoo, in Nuremburg, Germany.
Knut, polar bear cub
In this March 23, 2007 file photo, Knut, the polar bear cub, has its first public appearance with his keeper in the Berlin zoo. A Berlin zoo official says world-famous polar bear Knut has died. Bear keeper Heiner Kloes said that four-year-old Knut died Saturday afternoon while alone in his compound. He says the cause is not yet clear. (AP Photo/Markus Schreiber)
Photo: Freek Van Den Bergh / AFP / Getty Images/SFGate
