Explore clear, practical articles about animals and the way they live.
No, jellyfish do not have brains, but they do have nervous systems. Instead of a centralized brain like those found in humans, fish, and many other animals, jellyfish possess networks of nerve cells distributed throughout their bodies. These nerve networks help them sense their surroundings, coordin
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No, jellyfish do not have brains, but they do have nervous systems. Instead of a centralized brain like those found in humans, fish, and many other animals, jellyfish possess networks of nerve cells distributed throughou···
Sea otters sometimes hold hands, or more accurately paws, while resting on the ocean surface to help prevent themselves from drifting apart. However, this behavior is much less common in the wild than popular photographs···
Do sharks have bones? Learn why shark skeletons are made of cartilage, whether sharks have backbones and ribs, and how shark fossils form.
Can owls move their eyes? Discover why owl eyes are fixed, how far owls turn their heads, and how their unusual eyes help them hunt at night.
Do frogs drink water through their mouths? Discover how frogs absorb water through their skin, what the drinking patch does, and how they stay hydrated.
Do turtles have teeth? Discover how turtles bite, eat, and crush food with their beaks, plus why baby turtles have a temporary egg tooth.
Can snakes blink or close their eyes? Learn why snakes have no eyelids, how their eye caps work, and how snakes sleep and shed their skin.
The Kangal is often said to have the strongest dog bite, but the famous PSI rankings are poorly supported. See what scientific dog bite-force studies actually show.
Cats can kill and eat rats, especially smaller ones, but large adult rats can be difficult prey. Learn what cats hunt, whether cats control rats and the health risks.
Most frogs reproduce through amplexus and external fertilization. Learn how frogs mate, lay eggs, develop into tadpoles and use unusual reproductive strategies.
Frogs are amphibians, not reptiles. Learn the key differences in skin, eggs, reproduction, breathing and life cycle between frogs and reptiles.
Axolotls commonly live 10–15 years in captivity with proper care. Learn what affects lifespan, how long wild axolotls live and how to help one live longer.
A group of cats is called a clowder. Learn the difference between a clowder, colony, glaring, litter and kindle, plus how cats actually live in social groups.
Baboons are famous for red or pink rumps, but Japanese macaques, drills and other monkeys can also have colorful hindquarters. Learn why they are red.
Mountain lions can make eerie screams and caterwauls, especially during mating communication. Learn what cougar screams mean and what other sounds they make.
Cats don't smile exactly like humans, but they use slow blinks, relaxed faces, ears, whiskers and body language to communicate comfort and positive emotion.
Penguins keep their feet just above freezing using restricted blood flow, countercurrent heat exchange and cold-adapted tissues. Learn how they stand on Antarctic ice safely.
Wolves do not actually howl at the moon. Learn why wolves howl, how far their calls travel, what pack howls mean and why we hear them more often at night.
Camels can often go about 7–10 days without drinking in hot conditions and sometimes longer. Learn how humps, kidneys, body temperature and rapid rehydration help them survive.
Gorillas are primarily herbivores, eating leaves, stems, shoots and fruit, but some also consume ants and termites. Learn what mountain and lowland gorillas eat.
Learn how spiders mate, why males use pedipalps instead of direct sperm transfer, how courtship works, and whether female spiders really eat males.
Most black snakes in the U.S. are non-venomous, but some venomous cottonmouths can appear black. Learn how to identify racers, rat snakes, indigo snakes and other dark snakes safely.
Most backyard roosters can live 5–10 years. Learn how breed, predators, disease, housing and flock management affect a rooster's lifespan.
Can cats eat peanut butter? Learn whether a small lick is safe, why peanut butter isn't a good regular treat, what ingredients to avoid and what to do after accidental ingestion.