Nov. 22, 2011: Entomologist Dave Kavanaugh, dressed as Santa Claus, holds onto Miles, a male reindeer, as they pose for reporters on the Living Roof at the California Academy of Sciences in San Francisco. The reindeer will be a part of the Academy's holiday program that will be exhibited until January 16, 2012. The Living Roof Project is an ongoing citizen science program designed to give community members an opportunity to learn about the Academy’s unique roof ecosystem while contributing to important baseline data regarding the many plants, birds, and arthropods that inhabit and utilize the Living Roof’s 2.5 acres of green space.

Source: AP Photo/Jeff Chiu