They have three hearts, two of which help move their blood beyond their gills. Their third heart’s function is to circulate blood to their organs. The third heart does not beat while an octopus swims, which is part of why swimming exhausts them so much and they prefer to crawl. Octopuses also have blue, copper-based blood, unlike a human’s iron-based blood. This difference in blood type helps octopuses survive in colder waters that have lower amounts of oxygen.
The Bluestripe snapper lives in tropical waters around the world. They live in coral reefs, often near caves, and in shallow lagoons. In the 1950s, the Bluestripe snapper was introduced to the waters of Hawaii as a potential food source, but their low economic value prevented them from being a continued food source.
When a Humpback whale is born, it can weigh up to 2,000 pounds and reach up to 15 feet in length. These young whales, called calves, stay with their mothers to nurse for anywhere between 6 to 10 months, until they are about 24 to 27 feet long.
There are two main groups of whales: baleen whales and toothed whales. Baleen whales have fibrous baleen plates in their mouths that allow them to filter larger quantities of krill, plankton, and crustaceans. These plates are made out of keratin, which is the same protein that forms human fingernails and hair.
Caribbean Reef Sharks are the first and only species of shark to rest or “sleep” on the ocean floors inside reef caves. Because of this, they have been given the nickname “sleeping sharks”.
Did you know that all Clownfish are born male? Clownfish have a strict hierarchy, the most aggressive female is at the top. Because all Clownfish are born male, when the top female dies, the most dominant male will turn itself into a female and take its place at the top of the hierarchy.
Did you know that Jellyfish may have lived millions of years before the dinosaurs? A Jellyfish fossil found in Utah is thought to be over 505 million years old while scientists believe the dinosaurs roamed the Earth around 245 to 66 million years ago. That means jellyfish were around nearly 250 million years before the dinosaurs!
Did you know the Moorish Idol supposedly got its name from the Moors of Africa who believed the fish brought happiness? Moorish idols inhabit the waters of the Pacific and Indian Oceans at depths of between 10 and 600 feet.
Dolphins are incredibly intelligent animals. They have been seen using tools, in the form of sponges, to protect their snouts while looking for food. They are also able to identify each other based on their signature whistle sounds. Just as each dolphin has a signature sound, they also each have unique dorsal fins which can be helpful in identifying them.
Green Sea Turtles are the only species of sea turtle that is an herbivore. These turtles got their name because their diet consists of seagrass and algae which contributes to the green color of their fatty tissue.
Great Hammerheads use their hammer-shaped heads to find and eat their prey, which can include crabs, squids, various fish and occasionally, other small sharks. Their hammer-shaped heads contain electrical receptors that help them find their food, even if their prey is hidden in the sand. Unlike other species of Hammerheads, Great Hammerhead sharks hunt in solitary.
Manatees are more closely related to the elephant than they are to other marine creatures. The cow-like creatures are thought to have inspired mermaid legends. Manatees typically come up for air every 5 minutes. However, when it is resting, the aquatic mammal can hold its breath for up to 20 minutes. Manatees swim at an average of 5 miles an hour, which is why algae and barnacles can often be found on the backs of manatees. Manatees don’t have the neck vertebra that most other mammals have, meaning that they must turn their entire bodies if they want to look around.
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