Sharks are a type of fish with a full cartilaginous skeleton and a streamlined body. They respire with the use of five to seven gill slits. Sharks have a covering of dermal denticles to protect their skin from damage and parasites and to improve fluid dynamics ; they also have replaceable teeth. Shark teeth are prized by collectors for their beauty, and because they are the only surviving relics of ancient sharks that are now extinct. Sharks range in size from the small pygmy shark, a deep sea species of only 22 centimetres in length, to the whale shark , the largest fish, which grows to a length of approximately 12 metres. The bull shark is the best known of several species to swim in both salt and fresh water and in deltas.

all is made by original basswood and first-class workmanship, as all 3D puzzles have no paint, so it is lead-free and safe toy for Children.

 Ages 6 and above.