Words that start with A

Sea anemones are closely related to coral and jellyfish. They eat small sea creatures and small fish that drift past them into their tentacles. The tentacles have poison in them, and the anemone stings them to kill them before it eats them.
Sea anemones spend most of their lives stuck to the same rock or other surface, but can unstick themselves and swim to a new rock if conditions aren't good for them, such as if their rock dries out for too long or something is trying to eat or damage the anemone.
Sea anemones can reproduce in the usual way by releasing eggs and sperm, but they can also reproduce by budding off new anemones or by splitting themselves in half to form a new anemone.

Anger is what you are feeling when you are angry.

Anglerfish are small, predatory fish. They have one or more long, thin, flexible spines on their heads with a fleshy lump at the end. They can move this spine around and dangle the lump like bait in front of their mouths.
Anglerfish are fairly rare and have an unusual way of reproducing. Male anglerfish are much smaller than females, and when they are mature they bite onto a female and then wither away to nothing but reproductive organs. They live like parasites on the female's bloodstream.

The anhinga is a long-necked water bird that looks similar to a heron. It lives around freshwater wetlands and slow-moving rivers, especially in warmer parts of the Americas and beyond. They dive to spear fish with their sharp beak.

Anise or aniseed is a small plant related to fennel and celery. It is grown for its seeds, which have a similar taste to liquorice. It is a different plant to star anise.

You annoy someone by bothering them until they are irritated, but not to the point of them being angry.

The flies in the picture are annoying the horse.

Anonymous means that someone is unable to be identified, by sight or by name. The people in the picture are wearing masks so they can be anonymous.

An ant is a small, common insect found all over the world. They live in organised colonies that are mostly workers, with one queen.

The anteater is an animal that, as its name suggests, eats mainly ants and termites. They have a long, sticky tongue that they flick into ant nests. There are four different types of anteater, the anteater in the picture is the giant anteater. They are related to sloths. Giant anteaters can grow up to 2.4 metres long, including their tail. Baby anteaters ride on their mother's back.

Antelope is a word used for any one of a large group of animals that are related to goats, sheep and cows. Many antelopes look like deer but are actually not closely related - antelopes keep their horns through their lifetime and deer shed their horns every year.
The antelope in the picture is an eland.