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http://www.sheppardsoftware.com/content/animals/hidden%20animals/Hidden%20Animals.htm
http://www.sheppardsoftware.com/content/animals/kidscorner/gamesforkids.htm
https://kids.nationalgeographic.com/games/adventure/krill-smackdown/
https://kids.nationalgeographic.com/games/action/bug-bash/
https://kids.nationalgeographic.com/games/action/arctic-fox-snowboarding/
http://www.bbc.co.uk/schools/scienceclips/ages/8_9/friction.shtml