Creatures of the Deep Sea

There is so much going on in the sea that we are unaware of. Here are some trivia, fun facts on the creatures of the sea, courtesy of Facebook pages ‘Colours of Nature’, ‘Ancestral Stories’, ‘Weird Facts’, ‘Unbelievable Facts’, ‘Today I Learned’, Science and facts, Crazy creatures, The Knowledge Factory, The study secrets etc… However, I do not know if they are true. Some of them sound really incredible.

Cuttlefish just passed a cognitive test made for human children.

Scientists gave them a version of the “marshmallow test,” the experiment used on kids to measure self-control. The rules were simple: wait a little longer, get a better reward. Cuttlefish understood it. They held back. They strategized. They made decisions based on future payoff.

That alone is wild. But here’s where it gets stranger. These animals have three hearts. They see polarized light that humans can’t detect. Their skin can think independently, reacting faster than their brain. They can change color, texture, and pattern instantly—even though they’re technically colorblind. They use reflections off their own skin to understand the colors around them.

Their brain is shaped like a donut, and their esophagus runs straight through the center. They literally eat through the middle of their nervous system. And somehow, with all that chaos, they still mastered a test built for human psychology.

Cuttlefish don’t just camouflage. They plan. They remember. They weigh choices. They adapt their behavior depending on whether a reward is worth the wait.

This is not a simple sea creature. This is a quiet genius living in the sand, proving that intelligence can evolve in the strangest, most unexpected forms. – A Facebook post by ‘Cronus’

When a whale dies and its heavy body sinks down to the deep sea floor, it becomes a rich patch of life. This event is called a whale fall. In the dark, cold deep water, the whale's body brings a large amount of food and shelter to animals that rarely find such a feast. For many creatures, a whale fall is like an island of plenty.

At first, big scavengers such as sharks and large fish strip the soft flesh. After that, smaller animals and crabs pick at what is left. Later, bacteria and other tiny organisms break down the whale’s bones and release chemicals into the water. Special worms and microbes can feed on those chemicals and live right on the bones. Different kinds of life arrive in stages, each using the whale in its own way.

A whale fall can support life for years or even decades as the body slowly disappears. These spots are important because they recycle nutrients in the deep ocean and help many species survive in a harsh place. Scientists study whale falls to learn how deep-sea ecosystems work and how life can make use of rare food in a dark world. – A Facebook post by ‘Colors of Nature’

Imagine diving beneath Antarctic ice and hearing something that sounds like a child’s bedtime melody drifting through the dark water. That eerie, gentle music comes from male leopard seals during breeding season. Despite being apex predators, their voices rise in soft, high notes that echo beneath the ice like a lullaby. Marine biologists recording these sounds were stunned by how calm and rhythmic they felt, completely unlike the fierce reputation of the singer.

Studies from the University of St Andrews found that each male uses only a small set of basic notes, repeating them in strict patterns that resemble human nursery rhymes. What makes each seal unique is the order of these sounds, essentially a signature song. One male can sing for up to 13 hours a day, diving, vocalizing for two minutes, surfacing to breathe, and repeating this cycle hundreds of times.

Researchers believe these long, steady songs advertise stamina and fitness to distant females and help individuals identify each other across vast, dark waters. Hidden beneath the ice, Antarctica hosts one of the strangest concerts on Earth. – A Facebook post by Patrick Barnes

Every morning the small underwater world wakes up soft and slow. Light slips through the water and finds the seahorse couples curled among the plants. When they see each other, they move closer. They wrap their tails for a gentle hug, like two hands holding. The water around them shivers with tiny ripples as they begin their quiet greeting.

Their little dance is simple but full of feeling. They bob up and down and turn in circles, matching each other’s steps. Fins flutter like slow claps, and their heads tilt the same way, as if listening to a secret song. The hug and the dance are a promise: they are together for the day, they will watch over one another, and they will share whatever comes.

Watching them feels calm and hopeful. The ritual is small, but it keeps them close and steady. It reminds anyone who sees it that love can be quiet and gentle. In the hush of the sea, a hug and a little dance are enough to start the day right. – A Facebook post

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