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Sticker of Pacific coast tick
Bug card No. 3200 of 4,939

Pacific coast tick

Dermacentor occidentalis
Eats: BloodScorpions, ticks and friendsGardens and meadows8 legsNot an insect, but a bug cousin

The Pacific coast tick is a tiny silvery grey tick from California. Like all ticks, it has eight legs and is a cousin of spiders. It waits on plants and climbs onto animals, and sometimes people, to drink blood.

Fun fact: this one is not an insect. It is an arachnid with eight legs, a cousin of the spiders.
Lives in
Coastal California, in grassy and bushy places
Length
4.5 mm (0.18 in)
Top speed
about 0.02 km/h (0.01 mph)
On foot, estimate
Can it hurt you?
Can sting
It can bite and drink blood. Ticks can carry germs, so after playing outside check your skin, and tell a grown-up if you find one.
What does it eat?
It drinks the blood of animals, and sometimes of people. After a big meal its body swells up.

Ticks: how to stay safe

  • In Estonia, the castor bean tick and the taiga tick can carry Lyme disease and tick-borne encephalitis.
  • Ticks wait on grass stems, from ankle to knee height. Long trousers tucked into socks and light clothes help you spot them.
  • After playing outside, check your body, your hair and your pets for ticks.
  • Found a tick? A grown-up should take it out quickly with fine tweezers or a tick tool: hold it close to the skin and pull slowly. No oil or alcohol on it. Then wash the spot.
  • There is a vaccine against tick-borne encephalitis, for children too from one year old. Ask your doctor.
  • If in the weeks after a bite you get a fever, feel ill or see a red patch that grows, go to a doctor.

Source: Terviseamet (Estonian Health Board)

For real!Photo of Pacific coast tick
Picture by (c) Cricket Raspet, some rights reserved (CC BY). CC BY 4.0, via Wikimedia Commons.

How big is it?

How long is it?

Pacific coast tick about 4.5 mm long (0.18 in)A grain of rice about 6 mm (0.24 in)
small enough to sit on your fingernailneeds 3 minutes to cross a dinner table

How big is Pacific coast tick compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast is it?

cool stuff

Fun facts

1

When it has not eaten, it is only about 4.5 millimetres long, smaller than a grain of rice.

2

Its hard outer shell is a silvery grey colour.

3

It belongs to the hard ticks, also called wood ticks.

you asked

Most asked questions about Pacific coast tick

?Do Pacific coast ticks bite people?

Yes, people are one of the animals it can feed on. Check for ticks after being outside and ask a grown-up to remove any you find.

?How big is the Pacific coast tick?

About 4.5 millimetres long before it has eaten.

For bug experts

Scientific name
Dermacentor occidentalis
Group
Scorpions, ticks and friends
Family
Ixodidae
Classification
Arachnida > Ixodida > Ixodidae
Lives on
North America

Where the facts come from

  1. Dermacentor occidentalis (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. Picture by (c) Cricket Raspet, some rights reserved (CC BY). CC BY 4.0, Wikimedia Commons. The sticker of this bug is drawn from this picture.

If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at [email protected] and we will fix it.

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More from the same group: Scorpions, ticks and friends

Also at home here: Gardens and meadows

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