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Tick

Adapted from Wikipedia · Discoverer experience

A tick preserved in ancient tree resin, showing how tiny creatures can be trapped and studied by scientists.

Ticks are small creatures that belong to the group of animals called arachnids, which also includes spiders and mites. They are special because they live by attaching to animals and drinking their blood. Adult ticks are usually about 3 to 5 millimetres long, but they can grow larger after they have eaten.

Ticks are found all around the world, especially in warm and damp places. There are two main types of ticks: hard ticks and soft ticks. Hard ticks have a tough shell on their backs, while soft ticks do not. Both kinds have eight legs and can sense animals from a distance by detecting smells, heat, moisture, or movement.

Ticks go through four stages in their lives: they start as eggs, then become tiny larvae, grow into nymphs, and finally develop into adults. During each stage, they need to feed on blood. Because they drink blood, ticks can sometimes carry diseases that make animals and people sick.

Biology

Ticks are small creatures that feed on blood. They belong to a group of mites and are different from other mites. There are three main families of ticks: Ixodidae (hard ticks), Argasidae (soft ticks), and Nuttalliellidae, which has only one known species.

Fossilized tick in Dominican amber

Ticks have special body parts that help them attach to hosts and feed on blood. They can survive in tough conditions and hide in moist areas to avoid drying out. Most ticks are brown or reddish-brown, but some have white patterns.

Ticks go through several stages in their life cycle, including egg, larva, nymph, and adult. Different tick families have different life cycles, with some needing one host and others needing multiple hosts over several years.

Relationship with humans

Tick-borne disease

A sign in a Lithuanian forest warning of high risk of tick-borne encephalitis infection

Ticks can carry many harmful germs, such as bacteria, viruses, and protozoa. These germs can make animals and people sick. Some types of bacteria cause diseases like Lyme disease, which is the most common disease spread by ticks in the United States. Other diseases include Q fever, Colorado tick fever, and tularemia.

Some ticks, like the Australian paralysis tick, can also be poisonous and cause serious health problems. Scientists study these ticks very carefully in special labs to keep everyone safe.

Population control measures

Crimean-Congo hemorrhagic fever virus (CCHFV) cycle and its routes of transmission. CCHF is the most widely distributed tick-borne viral disease in the world.

Trying to control the number of ticks that spread diseases has been difficult. Some natural methods can help reduce ticks. Animals like red foxes and opossums can eat many ticks, which helps lower the risk of disease. Birds such as the helmeted guineafowl also eat large numbers of ticks.

In the arts

In 2020, the world's first monument to a tick was built in the city of Ufa in Russia. The stone monument, placed on a base from the Ural Mountains, carried the message: "Same as you I also want to live."

The Tick is a funny superhero character made by cartoonist Ben Edlund in 1986.

Images

A close-up photograph of Promegistus armstrongi, a small mite species found in Australia.
A close-up of the insect Sternothyrus braueri in the Seychelles, showcasing its unique features in its natural environment.
A close-up photo of a black-legged tick for educational use in learning about insects and nature.
A female tick from the Argas species with a batch of eggs it has laid, useful for learning about arachnids and their life cycles.
A tiny tick waiting on a blade of grass, hoping to find a host in Central Massachusetts.
A scientific image showing tiny structures inside ticks, which helps scientists study diseases.
The life cycle of a tick, showing its different stages from egg to adult.
A sign warning visitors about high tick density in the Devil's Punchbowl Conservation Area.
A close-up photo of a lone star tick, showing its distinctive star-shaped spot, which is helpful for learning about insects and their roles in nature and health.
Microscopic view of a mite species showing its body structure for learning about tiny creatures.

Related articles

This article is a child-friendly adaptation of the Wikipedia article on Tick, available under CC BY-SA 4.0.

Images from Wikimedia Commons. Tap any image to view credits and license.