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excellent description of how to teach conservation of momentum to students. 

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.

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.

excellent discussion of how students discovered momemntum conservation via modeling. Also check out previous three posts.