Teeth

http://en.wikipedia.org/wiki/Goblin_shark, http://dsc.discovery.com/sharks/goblin-shark.html,
http://news.nationalgeographic.com/news/2007/02/070209-goblin-shark.html
Some ferocious examples of monster teeth.
http://en.wikipedia.org/wiki/Tigerfish, http://www.goliathtigerfishing.com,
http://www.youtube.com/watch?v=KY9oyncF070,
http://animal.discovery.com/fish/river-monsters/goliath-tigerfish
http://www.youtube.com/watch?v=7-j1_Yzx1go,
http://news.nationalgeographic.com/news/2009/02/photogalleries/monster-fish-congo-missions,
http://www.bing.com/videos/watch/video/hooking-a-goliath-tigerfish/pmcedek,
http://en.wikipedia.org/wiki/Hydrocynus_goliath
Hardly paranormal, but various things in nature could have easily been morphed as part of a monstrous lab experiment. Such is the depiction in the movie, Prometheus.
http://paranormal-intersection.blogspot.ca/2012/05/worms-eels-and-sea-snakes.html
The Thing provides an interesting depiction of a creature that can practically absorb & replicate any life form.  
http://paranormal-intersection.blogspot.ca/2011/10/thing.html