Here are the most accurate measurements of the ocean's biggest animals. These are confirmed measurements, unlike many found on the internet that state outrageous numbers.

Nearly 11 kilometers deep, the ocean is still a noisy place, according to scientists that have eavesdropped on the deepest part of the world's ocean, and instead of finding a sea of silence, discovered a cacophony of sounds both natural and caused by humans.

For three weeks, a titanium-encased hydrophone recorded constant ambient noise from the ocean floor at a depth of more than 36,000 feet, or 7 miles, in the Challenger Deep trough in the Mariana Trench near Micronesia. The ambient sound field is dominated by the sound of earthquakes, both near and far, as well as distinct moans of baleen whales, and the clamor of a category 4 typhoon that just happened to pass overhead.

The hydrophone also picked up sound from ship propellers. Challenge ...

This is the colourful candy-striped land snail (Liguus virgineus), and it’s only found on Haiti, Dominican Republic and Cuba. For years its colourful shell made a popular souvenir for travellers visiting these Caribbean islands, but now a law forbids people from harvesting the shells and selling them.

This is the porcupine crab (Neolithodes grimaldii), found in the deep sea bed along the continental slopes of the Atlantic Ocean. A member of the king crab family, its carapace, or body, can stretch up to 18 cm long, and it can weigh over 2 kg. But that's nothing compared to the blue king crab (Paralithodes platypus) from Alaska, which weighs a whopping 8 kg. ...

The Leatherback Sea Turtle is the largest turtle in the world, weighing approximately 900 kg. Contrary to appearance, the leatherback doesn't actually have a shell. What looks like a shell is in fact a leathery skin supported by small bones. This gives it a flexibility that a solid shell would not provide, allowing it to dive to astonishing depths.

Meet the guineafowl puffer (Arothron meleagris), all puffed-up and poisonous to deter any would-be predators. Found throughout the Indo-Pacific and Eastern Pacific Oceans, this spotty species loves feeding on tiny marine invertebrates and the tips of coral.