91色情片

A naturalist and gifted writer who has spent 15 years observing both captive
and wild ravens reports on their hunting, socialising, mating and other skills,
all in the interest of determining whether these very clever birds have what
humans deem intelligence. They lie, they play, and, Bernd Heinrich says in
The Mind of a Raven, they think. Published by Cliff Street Books,
拢7.99, ISBN 0060930632.