Parthenogenesis occurs in the hammerhead shark and the blacktip shark. As with other requiem sharks, the blacktip shark is viviparous. The blacktip shark has a worldwide distribution in tropical and subtropical waters. The blacktip shark also performs this behavior, though not as often. In the same year, a female Atlantic blacktip shark in Virginia reproduced via parthenogenesis. The smoothtooth blacktip shark has only been recorded from eastern Yemen and Kuwait, some apart. The Australian blacktip shark is known to form large groups, segregated by size and sex. The blacktip shark is popular with recreational anglers in Florida, the Caribbean, and South Africa. Superficially, the smoothtooth blacktip shark resembles the blacktip reef shark ("C. melanopterus").