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Ladybugs are cannibals
Ladybugs are cannibals
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These brightly coloured beetles aren’t afraid to turn on each other when food is scarce. If it’s a matter of survival, adult ladybugs will eat other freshly moulted or newborn ladybugs. The beetles also have a wicked defence mechanism: When startled, ladybugs emit a foul-smelling fluid from their leg joints that helps scare away predators.

Starfish have ghoulish eating habits
Starfish have ghoulish eating habits
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It may come as little surprise that these unusual creatures have a few biological eccentricities – they see through tiny “eyespots” at the tip of each arm, for example. But their eating habits qualify as downright grotesque. To consume a mussel or clam, the five-pointed critter pries the shell open slightly, ejects its stomach from its mouth into the shell, digests the animal, then slides its stomach back into its own body.

Snails have razor-sharp teeth
Snails have razor-sharp teeth
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How terrifying can an animal really be if it moves at an average speed of 0.048 kph and leaves behind a trail of goo? One look into a snail’s mouth will tell you: Gastropods, including snails and slugs, have thousands of tiny teeth located on a ribbon-like structure called a radula. Depending on the species, they use these teeth as a poison harpoon, to cut prey, or, in the case of the ghost slug, to seize and devour earthworms.

Slow loris monkeys have poisonous elbows
Slow loris monkeys have poisonous elbows
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The doe-eyed slow loris is a popular exotic pet, but these little furballs are one of the only poisonous mammals in the world. Normally no more than 38cm long, slow lorises produce a toxic secretion from the brachial gland in the upper arm that can cause a severe allergic reaction in other mammals. When threatened, the creatures lick the secretion and bite the predator, delivering the poison into the wound.

Polar bears are vicious predators
Polar bears are vicious predators
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Polar bears may look cute and cuddly, but they are the world’s largest land predator, often stalking the breathing holes seals make in the ice. Using their excellent sense of smell, polar bears wait until they detect the seal’s breath, then reach into the hole and drag the seal out onto the ice. Male polar bears have been known to attack and kill prey twice their size, including walruses, beluga whales and narwhals.

Margays are psychological manipulators
Margays are psychological manipulators
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These jungle cats may appear to be friendly if you happen to spot them in the Amazon rainforest, but these kitties are nothing like your typical house pet. The way they survive is downright evil: when Margays are hungry, they will mimic the cry of their intended prey to lure them over. According to National Geographic, it’s the first documented case of a cat using vocal imitation as a hunting device.

Dolphins like to bully and torture others
Dolphins like to bully and torture others
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We know what you’re thinking – how could such majestic, calm creatures like dolphins be so mean? Well, the unfortunate truth is that they can be actually quite violent when they’re in a playful mood. Dolphins have been observed using baby sharks like volleyballs and in one instance, ganging up on and killing porpoises in unexplained acts of aggression.

Female penguins will kidnap other’s chicks
Female penguins will kidnap other’s chicks
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Those adorable waddling penguins you love can actually be baby-stealing meanies if they lose their own chicks. While the kidnapping only lasts for anywhere between a few hours to a week, it’s not as if the kidnapper returns the baby chick when she loses interest. It’s actually worse – the kidnapping penguin will abandon her stolen chick, leaving it to fend for itself and likely perish.

Baby spiders eat their mum
Baby spiders eat their mum
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Just like the ladybug is a bit of a cannibal, so are some species of spiders. The process is called Matriphagy, and it happens after the mother has depleted her resources by producing a nourishing fluid that they feed to their babies by mouth. Once the mother has no more fluid, the baby will crawl on top of her and start eating its mother. Talk about an ungrateful baby.

Kangaroos are ruthless mothers
Kangaroos are ruthless mothers
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Don’t be fooled by the harmless seeming kangaroo that just hops around cutely. If in danger, a mother kangaroo will sacrifice its baby. The logical reason for this is because a baby can’t reproduce, so it’s up to the mother to keep herself alive so that the species can continue to thrive. A zookeeper from the North Georgia Zoo says that if a mother kangaroo has multiple babies, during times when the mum can’t support them all, she will keep one to be alive. Unlike humans, kangaroos definitely let their kids know who is their favourite.

This article first appeared on Reader’s Digest.

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