Dunkleosteus was a 30 foot long carnivorous tank

Dunkleosteus was a 30 foot long carnivorous tank. It was outlasted by sharks, but I am sure that is small consolation for the variety of creatures this beast ate. Instead of teeth, it had bony ridges, like a turtle. It has been calculated that they had a bite force of 8,000 pounds per square inch, putting it on par with crocodiles

Hermit crabs live in shells

Hermit crabs live in shells and as they grow change to newer, larger shells. The largest species can live 30 to 70 years or more. They are great climbers and diggers, and fun to watch. Some species live under water, like marine crabs, and others on land. Most are aquatic, living in saltwater, and even the land ones must return to the sea to breed. There are many different colors, like red, brown, and purple, with varying patterns such as dots and stripes. They are scavengers and omnivores, eating dead things and plants.

Millipedes are long, round, slow, and eat decaying vegetation

Unlike centipedes, millipedes are long, round, slow, and eat decaying vegetation. They also have 2 pair of legs per segment, as opposed to 1. They can have 36 to 400 legs, depending on the species. There are over 10,000 species. Millipedes burrow into the ground. Some may secrete a poison through their skin, and there are some mammals that get drugged off this secretion by licking the millipede. They defend themselves by curling into a ball and do not bite.

Centipedes are fast and aggressive

Centipedes are fast and aggressive. They can be found in the tropics and in deserts. They hunt at night and eat roaches, crickets, mice and bats. If bothered, they will bite or pinch, and are venomous. They have flattened bodies, a single pair of legs per segment, and can get up to twelve inches long. There are over 8,000 species.

Ants are everywhere

Ants are everywhere. They are predators, scavenger, and herbivores. They are very social and live in groups with a hierarchy. The colony is ruled by a queen, who is the only fertile female. The other, infertile females, are workers and soldiers. They communicate through pheromones, sounds, and touch and defend themselves by biting or stinging. They are related to wasps and bees. Some, like harvester ants are sold as food for pet horned lizards.

There are more than 350,000 species of beetles in the world

There are more than 350,000 species of beetles in the world, living in diverse places like deserts, tropical climates, and even in water. Some are pests that eat garden plants and some eat the pests, like aphids and mites, that eat garden plants. Some are useful in cleaning up carrion or dung. And some are eaten by other insects, animals, and birds. They lay eggs that hatch into larvae that can in some cases take years to become mature adults. The adults are generally not long-lived.

Most people think of roaches as pests

Most people think of roaches as pests. Yet only 5 or so out of 4,000 species of roaches are household pests. Roaches adapt easily to their surroundings, although they are typically found in warm areas. They are mostly omnivores, but there are some species that eat wood. They are fast and very hardy, and can survive without food for a long time, without air for up to forty five minutes, and being submerged in water for half an hour. It is believed that roaches would survive a nuclear holocaust, and they certainly have a higher resistance to radiation than humans. As pests, they can leave trails of bacteria with their feces and cause allergic reactions in humans.