The lowly tick is a subclass of parasitic arachnid, so small it is difficult to detect straight away. Their Haller’s organ is a unique complex sensory structure that smells out humidity, carbon dioxide and temperature, to identify suitable hosts in order to survive.

They can even detect infrared, light that feels warm but cannot be seen, enhancing their ability to survive in complete darkness. This peculiar combination ensures it is invisible to its host and, true to the original Greek definition of parasitos, remains: eating at another’s table...

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