Animals — Page 12

The jellyfish Turritopsis dohrnii can reverse its life cycle and become biologically immortal.

When facing physical stress or aging, this jellyfish can transform its adult cells back into the polyp stage, its…

Wombat feces have a perfect cubic shape.

The wombat intestine has variable elasticity, which molds the feces into cubes. This shape prevents the feces from…

Hummingbirds are the only birds capable of flying backwards.

The anatomy of a hummingbird's wings allows it to beat its wings in a figure-eight pattern, generating lift in both…

Koalas have fingerprints so similar to human ones that they are hard to tell apart under a magnifying glass.

Although koalas are marsupials and humans are primates, both evolved to grip tree trunks and branches. That…

Cows form close friendships and become stressed when separated from their best friends.

Animal behaviour studies have shown that cows create strong social bonds with specific companions. When separated…

Sloths can hold their breath underwater longer than dolphins, lasting up to forty minutes.

When entering the water, sloths slow their heart rate to one-third of its normal pace, conserving oxygen extremely…

Sharks have existed on Earth for about four hundred million years, making them older than the first trees, which emerged around 350 million years ago.

The earliest shark fossils date back to the Devonian period, long before the appearance of woody plants and primitive…

Butterflies possess chemoreceptors on their feet, allowing them to taste plants and determine if they are suitable for laying eggs.

When landing on a leaf, butterflies drum their feet to release the plant's juices. The receptors on their feet…

Dolphins sleep with only half of their brain at a time, keeping the other half alert.

As marine mammals, dolphins need to surface to breathe. If they fell completely asleep, they would drown. Therefore…

The wood frog can survive frozen for weeks.

During winter, up to 65 percent of the wood frogs body freezes. Its heart stops beating, breathing ceases and blood…

Sharks have no bones, their skeleton is made of cartilage.

Unlike most fish, sharks and rays have a skeleton entirely made of cartilage. Cartilage is lighter and more flexible…

Dung beetles use the Milky Way to navigate at night.

When rolling a ball of dung, dung beetles need to travel in a straight line so they do not return to the starting…

Koala fingerprints are so similar to humans that they have occasionally been confused at crime scenes.

Koala epidermis has papillary ridges very similar to humans in both pattern and size. This similarity is an example…

Wombat poop is cube-shaped, which prevents it from rolling away.

Wombats are the only known animals to produce cube-shaped feces. This unique shape is the result of varying…

Horned lizards squirt blood from their eyes to deter predators.

They increase blood pressure in their head to restrict outflow, forcing blood to shoot from the corners of their…

The mantis shrimp boils the water around it when it punches.

Its appendage reaches speeds of over eighty kilometers per hour. This rapid movement creates cavitation bubbles that…

Koalas have fingerprints that are almost identical to human ones.

The epidermal ridges of koalas evolved independently from those of primates. Under an electron microscope, it is very…

Wombat poop is shaped like perfect cubes.

Wombat intestines have walls with varying elasticity, which molds the waste into cubes. This shape prevents the poop…

Crows can recognize human faces and hold grudges.

Studies show that crows remember people who threatened them and can pass this distrust to their offspring and other…

The immortal jellyfish can revert its life cycle to the polyp stage.

When facing physical stress or starvation, Turritopsis dohrnii transforms its adult cells back into stem cells…

The wood frog freezes solid in winter and thaws in spring.

Its liver produces large amounts of glucose that acts as a natural antifreeze. This protects the cells from damage…

Butterflies taste their food through their feet.

The taste receptors are located on the bottom of their feet. By landing on a leaf, they immediately know if it is the…

Sloths can hold their breath for up to forty minutes.

By slowing their heart rate, they can retain oxygen much longer than dolphins, which typically need air every ten…

A group of pugs is called a grumble.

The origin of the term dates back to the nineteenth century, reflecting the characteristic and constant sound these…