Portal:Sharks/Did you know/9


 * ... that no more than 250 mature northern river sharks are estimated to live in the wild?
 * ... that the closure of the Tethys Sea 10–14 million years ago led to the sicklefin lemon shark and the lemon shark becoming separate species?
 * ... that the spined pygmy shark, dwarf lanternshark and pygmy ribbontail catshark are candidates for being the smallest shark in the world, all maturing at under 20 cm long?
 * ... that most attacks on humans by the blacktip reef shark consist of people being bitten on their legs or feet while wading in shallow water?
 * ... that the egg capsule of the crested bullhead shark has paired tendrils extending up to 2 m (6.6 ft), greater than the length of the adult shark?