Steven David Miller / A Perentie (Varanus giganteus) using its forked tongue to detect smells, Alice Springs Reptile Centre, Northern Territory, Australia, Captive. May.

Bence Mate / Sky lit by cloud-cloud lightning, with electricity pylon, Hungary, July 2006

Bence Mate / Forked lightning across horizon at night, with mixed flock of birds, Lake Csaj, Kiskunsagi National Park, Hungary, July 2006

Bence Mate / Forked lightning across horizon, with mixed flock of birds, Lake Csaj, Kiskunsagi National Park, Hungary, July 2006

Aflo / Y-10805 Forked lightning racing across sky at night

John Cancalosi / Sonoran Desert Sidewinder (Crotalus cerastes) with forked tongue extended, Arizona USA

Mark Jones / Komodo Dragon (Varanus komodoensis) large male testing ground for scent with specialized forked tongue, Komodo National Park, Komodo Island, Indonesia

Robert Valentic / Ranges stone gecko (Diplodactylus furcosus) male on rock. Waukaringa, South Australia. August.

Nigel Cattlin / Sundew (Drosera binata dichotoma) leaf with sticky glandular trichomes / hairs, insectivorous plant.

Nigel Cattlin / Sundew (Drosera binata dichotoma), close-up of leaf with sticky glandular trichomes / hairs, insectivorous plant.

Nigel Cattlin / Sundew (Drosera binata dichotoma), close-up of Fly (Diptera) stuck to sticky glandular trichomes / hairs of leaf.

Kirkendall-Spring / Uluhe fern (Dicranopteris linearis) frond unfurling, Hawaii Volcanoes National Park, Hawaii. December 2016.