Mammals
Reptiles
Insects
Arachnids
Mollusks
100

This rodent is considered an invasive species in Florida and parts of Europe.

What is the eastern gray squirrel?

100

This constrictor was a popular pet in Florida until it wreaked havoc on the ecosystem.

What is the Burmese python?

100

The world's deadliest animal.

What is the mosquito?

100

This species is the only spider to live almost entirely underwater.

What is the diving bell spider?

100

These mollusks produce pearls.

What are clams?

200

The biggest mammal on the planet, weighing in at about 400,000 pounds.

What is the Antarctic blue whale?

200

The biggest lizard in the world, weighing as much as 366 pounds.

What is the Komodo dragon?

200

These bugs are the most common animal in the world with a total population of 20 quadrillion.

What are ants?

200

These arachnids are commonly assumed to be a type of spider but are actually more closely related to scorpions and classified as their own species.

What are daddy longlegs?

200

They are snails without shells.

What are slugs?

300

The most abundant mammals on the planet.

What are humans?

300

This amphibian was released in Australia to limit pest beetles within sugar cane.

What is the cane toad?

300

This insect is a keystone species, supporting the reproduction of 80% of the world's flowering planets.

What are bees?

300

This arachnid species glows under UV light.

What are scorpions?

300

These mollusks are a keystone species because they filter and clean the surrounding water and provide habitat by creating reefs.

What are oysters?

400

The most popular pet in the world.

What is the dog?

400

The most venomous snake on Earth.

What is the Inland Taipan?

400

This is the strongest insect world, lifting 1,141 times its body weight.

What is the horned dung beetle?

400

This tarantula species is the biggest arachnid in the world, weighing up to 6.2 ounces.

What is the Goliath birdeater?

400

Other than humans, these animals are the only species to use insulin as a weapon.

What are cone snails?

500

This four-year conflict, between two great ape communities, was documented by Jane Goodall.

What is the Gombe Chimpanzee War?

500

This chameleon is the smallest reptile discovered, measuring in at 0.53 inches.

What is the Brookesia nana?

500

These insects aren't attracted to light—they navigate by the light of the moon, so the lights disorient them.

What are moths?

500

These two arachnid species are the most abundant.

What are ticks and mites?

500

This mollusk species has three hearts.

What are octopuses?

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