Top 10 sea animals facts Selected as the most interesting among nature related questions in Nature quiz What color is octopus blood?Blue. Both squids and octopuses have blue blood. They use an oxygen-carrying molecule in their blood called hemocyanin that contains copper. In cold conditions with low oxygen pressure, hemocyanin oxygen transportation is more efficient than hemoglobin oxygen transportation.Created by: Kasiablood facts » What is the inventive hunting technique of humpback whales?Bubble net. A group of whales swims in a shrinking circle blowing bubbles below a school of prey. Forage fish show a strong fear of bubbles and can be easily contained within a bubble curtain. The shrinking ring of bubbles encircles the school and confines it in an ever-smaller cylinder. The whales then suddenly swim upward through the "net", mouths agape, swallowing thousands of fish in one gulp.Created by: globalquiz.orgcarnivores facts » What kind of lobster is red when fully grown up?None. The normal coloration of lobster is dark bluish green to greenish brown, redder on the body and claws, and greener on the legs. An estimated one in 2 million lobsters are blue. All of them turn red after cooking.Created by: Hitter smashercolors facts » Which sea turtles are the deepest divers?Leatherback turtles are one of the deepest diving marine animals. Individuals have been recorded diving to depths as great as 1,280 meters (4,200 ft). Such depths are unreachable for turtles with hard shells, as these would have been crushed by the pressure.Created by: Jason Beagleyreptiles facts » What does swordfish use their sword for?Hunting. Swordfish charge at high speeds through forage fish schools, slashing with their swords to kill or stun prey (contrary to the popular belief, they do not "spear"). They then turn and return to consume their catch.Created by: globalquiz.orgfish facts » What is narwhal 'horn' really made of?It is a canine tooth. Usually, males have a single long tusk, the canine on the left side of the upper jaw that projects through the lip and forms a left-handed helix. The tusk grows throughout life reaching length of 3 m (10 ft). In some rare cases, both canines grow equally long, forming two tusks. In the Middle Ages, narwhal tusks were sold as unicorn horns.Created by: Bettyteeth facts » Box jellyfish have sophisticated eyes with a lens and a retina. How big is its brain?Jellyfish have no brain. Their speed and vision leads some researchers to believe that box jellyfish actively hunt their prey. Since they have no brain, the mechanisms that could make it happen remain unknown.Created by: Paul Caspackzoology facts » Why is this seahorse male so thick?It is pregnant. Seahorse males deliver the babies. After mating, the fertilized eggs are embedded in the pouch wall and become surrounded by a spongy tissue. The male provides oxygen and supplies the eggs with prolactin, the same hormone responsible for milk production in pregnant mammals.Created by: globalquiz.organimals facts » Which turtles are the biggest?Leatherback. The leatherback sea turtle, the only extant member of the family Dermochelyidae, is the largest of all living turtles and is the fourth largest modern reptile behind three crocodilians. In the Caribbean, the mean size of adults was reported at 384 kg (850 lb) in weight. The largest ever found weighed 916 kilograms (2,020 lb).Created by: globalquiz.orgnature facts » What kind of animal is a seahorse?A fish. Although seahorses are bony fish, they do not have scales, but rather thin skin stretched over a series of bony plates, which are arranged in rings throughout their bodies.Created by: globalquiz.orgnature facts » Play nature quiz and see all the questions.