The Giant Freshwater Whipray. This endangered species, which can reach a total length of 4. 5 m (almost 15 ft) and a
disc width of almost 2 m ( 6. 5 ft), occurs in the rivers of Southeast Asia, New Guinea, and tropical Australia.Photo by
Zeb Hogan; used with permission
An upper-jaw tooth from the extinct Megatooth Shark, with two teeth from a living White Shark shown for com-
parison. The Meg tooth measures 135 mm ( 5. 5 in) on the slant. The largest Meg tooth found was 17. 9 cm ( 7. 25 in)
long, suggesting an animal perhaps 17 m ( 55 ft) long.Wikimedia Commons, http://upload.wikimedia.org/wikipedia/commons/ 4 / 43
/Megalodon_tooth_with_great_white_sharks_teeth- 3 - 2 .jpg
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