2. Hippopotamus                                                                                            PAGE 2 OF 6

The common hippopotamus (Hippopotamus amphibius), especially territorial bulls or mothers protecting their calves, can be highly aggressive towards humans, killing dozens of people every year. Jacques-Yves and Philippe Cousteau were the first to film them underwater using a fake hippo named Lolita in 1978.

3. Irukandji jellyfish                                                                                      PAGE 3 OF 6

The Irukandji jellyfish (Carukua barnesi) measures only 0.6 in. (1.5 cm) to 1 in. (2.5 cm) across with four 20-inch (50 cm) tentacles. And yet, accidental encounters by humans and this very small jellyfish have resulted in the deaths of at least 70 people in the past 50 years.

4. Colossal squid                                                                                           PAGE 4 OF 6

The colossal squid (Mesonychoteuthis hamiltoni) is the largest of all squids. Its suckers are lined with small teeth and its limbs are equipped with sharp hooks. In 2007, a colossal squid weighing an estimated 450 kg (990 lbs), and measuring about 10 m (33 ft) long, was caught by a fishing vessel in the Ross Sea.

5. Megalodon shark                                                                                      PAGE 5 OF 6

Now extinct, the largest ever shark species measuring up to 16 m (53 ft) in length ruled the oceans 16 to 1.5 million years ago. With its large teeth up to 18 cm (7 in) long, it fed on whales and other large marine mammals. Megalodon teeth are commonly found by scuba divers in the Cooper River in South Carolina.

The Diving Almanac & Book of Records                                                 PAGE 6 OF 6

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