Interesting Science Videos

http://www.bbc.co.uk/nature/life/Common_Kingfisher
http://kids.nationalgeographic.com/kids/animals/creaturefeature/ostrich/
http://kids.nationalgeographic.com/kids/animals/creaturefeature/walruses/
http://kids.nationalgeographic.com/kids/animals/creaturefeature/vampire-bat/
http://kids.nationalgeographic.com/kids/animals/creaturefeature/panda/
http://kids.nationalgeographic.com/kids/animals/creaturefeature/platypus/

Comparison Model involving Addition and Subtraction of Numbers