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Tick Larva, Nymph or Adult? How to Tell the Stages Apart

TickSpot Guide · August 2026

In short: A tick goes through three stages — larva, nymph, adult tick — and they differ above all in size. The most reliable feature, though, is the legs: larvae have six, nymphs and adult ticks eight. It is the middle stage of all things, the pinhead-sized nymph, that matters most for humans — not the large, clearly visible adult tick.

The three stages at a glance

The feeding times come from the Robert Koch Institute (RKI, Germany's national disease-control agency). Why they matter so much is explained in "How long does a tick feed?".

The most reliable feature: count the legs

Sizes are hard to judge in everyday life — an engorged nymph can look bigger than an unfed adult tick. The number of legs, by contrast, is unambiguous: according to the ECDC, larvae have three pairs of legs, nymphs and adult ticks four. So if you count six legs, you are looking at a larva.

In practice that takes magnification. With TickSpot you can freeze the image and zoom in instead of staring at a single millimetre with a shaking hand — the same approach as when telling a tick from a mole apart.

Why nymphs of all stages pose the greatest risk

This is the most surprising point: it is not the large adult tick but the middle stage that causes most infections in humans. In the specialist literature, the nymphs' share of Borrelia transmissions to humans is often given as being on the order of around 90 percent. Three reasons come together here:

  1. They are very numerous — considerably more common than adult ticks.
  2. Their main season coincides with ours — they are particularly active at exactly the time when people are outdoors a lot.
  3. They are simply overlooked. At a good millimetre, a nymph hardly stands out — and the longer it feeds undetected, the higher the risk of transmission.

To put this in perspective: This figure comes largely from Lyme disease research, a substantial part of it from North America with a related tick species. The underlying principle, however — small, abundant, therefore overlooked — applies just as much to our native castor bean tick (Ixodes ricinus). Interestingly, nymphs are less often infected with Borrelia than adult ticks (figures from the Bavarian State Office for Health put this at roughly 10 percent for nymphs compared with about 20 percent for adults). Their sheer numbers and their invisibility more than outweigh that advantage. More on this: "How many ticks actually carry disease?"

How the life cycle fits together

A tick needs a blood meal at every stage in order to moult into the next one — the larva becomes a nymph, the nymph an adult tick, which then lays eggs. According to the ECDC, the complete cycle typically takes about three years, and under favourable conditions less.

This also explains how pathogens get into the tick in the first place: larvae mostly feed on small animals such as wood mice and pick up Borrelia there. As infected nymphs they then pass these on — to humans, among others. Adult ticks prefer larger hosts such as deer or cattle.

What this means for you in practice

You don't need to be able to identify the stage — every tick is removed the same way, see "How to remove a tick properly". The real lesson is a different one: don't look for what you picture a tick to be. The most dangerous stage is not the fat, obvious tick but the barely visible dark dot the size of a poppy seed. That is exactly what the inverted camera view is made for — it makes even that dot light up brightly instead of letting it disappear into your skin tone.

Nymphs are too small for the naked eye: TickSpot makes them visible — free, no sign-up.

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Sources

Note: This article provides general information and does not replace medical advice. Reliable identification of species and life stage is only possible by experts.

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