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cool cell animations of replication, translation, transcription, synthesis, etc. Tons of different cell functions are capture here.

large library of animation of various cell processes

I was surprised to discover, however, that "some exotic animal species that are endangered in Africa are thriving on ranches in Texas, where a limited number are hunted for a high price." Texas hunters have saved several endangered African species, unfortunately for the animals, the story does not end happily. Video from 60 Minutes below-some excellent material on incentives, ethics and conservation for classroom discussion.

very useful bio animations created by Carnegie Mellon

great video by creator of those awesome cell animations describing how he makes them. 

huge library of short medical animations

great idea--have students make stop motion movie animating various biological processes. 

Awesome evolution lesson using elementary students

cool article on scaling in animals in biology

This interactive infographic from Number Sleuth accurately illustrates the scale of over 100 items within the observable universe ranging from galaxies to insects, nebulae and stars to molecules and atoms. Numerous hot points along the zoom slider allow for direct access to planets, animals, the hydrogen atom and more. As you scroll, a handy dial spins to show you your present magnification level. While other sites have tried to magnify the universe, no one else has done so with real photographs and 3D renderings. To fully capture the awe of the vastly different sizes of the Pillars of Creation, Andromeda, the sun, elephants and HIV, you really need to see images, not just illustrations of these items. Stunningly enough, the Cat's Eye Nebula is surprising similar to coated vesicles, showing that even though the nebula is more than 40,000,000,000,000,000,000,000 times larger, many things are similar in our universe.

interesting post about how anthropomorphism might not be useful in describing biological behavior of animals, especially re: ants & slavery. 

This is a great explanation of why they always land on their feet. Since we can't bring in live cats to demo this, what could we do? Perhaps we could get students to record them doing this at home with their cats and have them offer an explanation. They could slow the video and draw lines through the axis of rotation and study it more closely in class.

One more great animation with a vector explanation as well. This one pulls in additional concepts that students should understand.

This looks like a very interesting science resource site with games, animations and graphics for science teachers. It seems particularly geared toward bio teachers. You need to create a free account to access some of the resources. 

great computer animation of conception

I could see this be a useful question for a biology class for either an essay of a PBL investigation. 

post contains very interesting video simulation showing electrons in a semiconductor responding to the applied voltage.