Did you know that until the 16th century, mariners and seamen referred to sharks as "sea dogs"? Sharks have been around for a long time--many scientists think a variation of the shark existed from over 420 million years ago!
Sharks belong to a large group of fish that have a skeleton made of cartilage instead of bone. Because of this, the only fossilized remains of ancient sharks are their teeth. The teeth of sharks constantly grow to replace older ones that wear out. It is estimated that sharks can lose up to 20,000 teeth in their lifetime. Some ancient sharks had teeth that grew as long as 4 inches.
This educational box features one such genuine shark tooth fossil that is over 100 million years old. On the back, there is an illustration outlining all the parts of the shark tooth.
Makes a great gift for the shark fan in your life, as well as an excellent stocking stuffer or party favor. Always a big hit with marine biology teachers.
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