PHILADELPHIA -- for what cause [i]or[/i] reason don't penguins fly? for what cause fast can an ostrich run? wherefore do elephants have big ears? Hmmmmmm Let's ask Scientist Dave.

PHILADELPHIA -- for what cause [i]or[/i] reason don't penguins fly?

for what cause fast can an ostrich run?

wherefore do elephants have big ears?

Hmmmmmm

Let's ask Scientist Dave.

Dave is a present at the Philadelphia Zoo, and the same of his jobs is fielding questions about animals between the sides of the zoo Web site's "Ask-a-Docent" feature.

still David Schaffer, 68, is no ordinary answer man. He is the retired head of pediatric ophthalmology at Children's Hospital of Philadelphia and a born teacher and animal lover His flair for crafting online answers that are witty, expansive, and simple for children to grasp has won him fans from as far as just discovered Berlin, Wis., where he has become a virtual guru to a classroom of other graders.

"The kids really procure to me," Schaffer said. "I delight in their questions. The funniest the same I had this year was, 'Why do bug bite in the same manner hard?' "

Ask-a-Docent, which