Juergen Freund / Paralytic tick (Ixodes holocyclus) with engorged body on human hand, this species affects many species, Spectacled flying fox (Pteropus conspicillatus) among them and infects them with a toxin that ca...

Aflo / Composite image of tick showing how its body expands after feeding

Nick Upton / Man releasing a Hedgehog (Erinaceus europaeus) after removing Hedgehog ticks (Ixodes hexagonus) from it, Chippenham, Wiltshire, UK, August 2017. Property and model released.

Nick Upton / Man inspecting a Hedgehog (Erinaceus europaeus) caught in his garden for Hedgehog ticks (Ixodes hexagonus) Chippenham, Wiltshire, UK, August 2017. Property and model released.

Nick Upton / Man inspecting a Hedgehog (Erinaceus europaeus) caught in his garden for Hedgehog ticks (Ixodes hexagonus) Chippenham, Wiltshire, UK, August 2017. Property and model released.

Nick Upton / Hedgehog tick (Ixodes hexagonus) removed from a Hedgehog (Erinaceus europaeus) with tweezers, Chippenham, Wiltshire, UK, August 2017. Model released.

Nick Upton / Hedgehog tick (Ixodes hexagonus) removal from a Hedgehog (Erinaceus europaeus) with tweezers, Chippenham, Wiltshire, UK, August 2017. Model released.

Nick Upton / Man releasing a Hedgehog (Erinaceus europaeus) after removing Hedgehog ticks (Ixodes hexagonus) from it, Chippenham, Wiltshire, UK, August 2017. Property and model released.

Mathias Putze/ BIA / Common Myna (Acridotheres tristis) feeding on ticks attached to Domestic Goat (Capra hircus), Kaziranga National Park, India

Jen Guyton / Tick embedded in the wrinkled skin of an African elephant (Loxodonta africana). The elephant was sedated by veterinarians to put a GPS collar on him.

Nick Upton / Hedgehog tick (Ixodes hexagonus) just removed from a Hedgehog (Erinaceus europaeus) at a rescue centre, Cornwall, UK, October.

Doug Wechsler / American dog tick (Dermacentor variabilis) adult female, PA, Morris Arboretum, Philadelphia, Pennsylvannia, USA, June.