Invertebrates

Crickets are a type of insect distantly related to grasshoppers. Crickets make a distinctive "chirping" noise. Crickets make this noise by rubbing their hind legs together.
There are many different varieties of cricket, and they all have a slightly different "chirp".

Crustaceans are a kind of arthropod that include crabs, lobsters, krill and barnacles. Most crustaceans live in the sea, but some like the woodlouse live on land.

Dragonflies eat mosquitoes and other small insects like flies, bees, ants, and butterflies. They are usually found around water because their babies or larvae, known as nymphs, live underwater.

Dung beetles are insects that feed on dung. There are many different kinds of dung beetle. Some of them roll dung up into balls and roll it away to use it later.

A firefly is a small beetle that glows in the dark. Many live in warm, grassy or wooded areas near the ground, especially where it's damp. The glowing light is made by the insect to communicate, usually to help find mates.

A fly is a very common insect that can fly, as the name suggests. Flies lay their eggs in rotting food or dead animals in the wild, and in your house they lay their eggs in any of your food that they find. The eggs hatch into maggots.

Gnats are any of a large variety of small, thin, flying insects that are often seen in large swarms. Their larval stage typically lives in water so they are common in swampy areas, or anywhere there is standing water.

A grub is the immature form of many insects, particularly beetles. Grubs usually live in the ground or in fallen leaves, eating rotting vegetation. The grubs you commonly see in your backyard will grow up to be either beetles or moths. Grubs all look quite similar to each other but can look dramatically different to the adult insect they will turn into.

Hermit crabs are not actually true crabs, but are distantly related crustaceans. Hermit crabs don't have a shell of their own, so they need to find the discarded shell from another creature to wear. As they grow, they have to find another shell to replace their old one.
Hermit crabs are found all over the world, and many people keep them as pets.

Horseshoe crabs are more closely related to spiders and scorpions than to crabs. They have six pairs of legs, a hard shell that looks like a horse's hoof, and a long tail. Their first pair of legs are very small and are used for putting food into their mouths.
Horseshoe crabs are called a living fossil because there are fossils of almost identical creatures found that are 230 million years old.
The two horseshoe crabs in the picture are upside down.