Mark Taylor / Horse riders showing skill in traditional game picking up money from ground whilst horseback, Song Kul Lake, Kyrgyzstan, August 2016.

Yva Momatiuk & John Eastcott / Waterbuck (Kobus ellipsiprymnus) male with engorged pre-orbital scent-glands below eyes, Masai Mara National Reserve, Kenya

Doug Wechsler / Giant toad showing paratoid gland behind eye {Bufo marinus} Costa Rica Guanacaste NP,

Mark Hamblin / 2020VISION / Greater sundew (Drosera anglica) close-up with insects caught in glands of leaf, Flow Country, Sutherland, Highlands, Scotland, UK, July

Mark Hamblin / 2020VISION / Greater sundew (Drosera anglica) close-up with insects caught in glands of leaf, Flow Country, Sutherland, Highlands, Scotland, UK, July

Georgette Douwma / Striped poison-fang blenny mimic (Petroscirtes breviceps) mimic of Striped blennie (Meiacanthus grammistes), which possesses a pair of large grooved fangs in the lower jaw with associated venom glands...

Georgette Douwma / Striped poison-fang blenny mimic (Petroscirtes breviceps) mimic of Striped blennie (Meiacanthus grammistes) which possesses a pair of large grooved fangs in the lower jaw with associated venom glands....

Albert Lleal / Mediterranean Black Widow (Latrodectus tredecimguttatus) abdomen showing silk glands, Spain

Tim Laman / Salt crystals on the surface of a (Avecinnia sp) mangrove leaf. This mangrove species can secrete salt through special glands on the leaf surface. One adaptation that allows it to live in salt water....

Tim Laman / Salt crystals on the surface of a (Avecinnia sp) mangrove leaf. This mangrove species can secrete salt through special glands on the leaf surface. One adaptation that allows it to live in salt water....

Fiona Rogers / Ring-tailed Lemur (Lemur catta) male 'palmar-marking' tree, using scent glands on the inner forearm (antebrachial organ). Berenty Private Reserve, Madagascar. Oct 2008.

Fiona Rogers / Ring-tailed Lemur male (Lemur catta) shaking small tree before 'palmar-marking' using scent glands on the inner forearm (antebrachial organ). Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) male 'palmar-marking' using scent glands on the inner forearm (antebrachial organ). Berenty Private Reserve, Madagascar. Oct 2008.

Thomas Marent / Cane Toad (Bufo marinus) the large swollen parotid glands behind the head of the cane produce a mixture of fourteen different toxins affecting the nervous system of any predator inexperienced enough t...

Flip de Nooyer / Long leaved sundew {Drosera intermedia} stalked glands on leaf surface, Holland

Flip de Nooyer / Long leaved sundew {Drosera intermedia} stalked glands on leaf surface, Holland

Flip de Nooyer / Long leaved sundew {Drosera intermedia} insects trapped on stalked glands on leaf surface, Holland

Doug Perrine / Australian flatback sea turtle (Natator depressus) nesting female with excretions from salt glands leaking out of eyes like tears, Crab Island, Torres Strait, Queensland, Australia

Juergen Freund / Mangrove leaf with crystalized salt, excreted by salt glands, Philippines

Juergen Freund / Cane toad / Giant toad (Bufo marinus) with poison from glands, an introduced species in Queensland, Australia

Juergen Freund / Cane toad / Giant toad (Bufo marinus), an introduced species in Queensland, Australia. Close-up of poison glands

John Cancalosi / Close-up of Grass snake {Natrix natrix} defending itself from predators by feigning death. Sometimes it also emits a foul-smelling substance from its anal glands, making it smell like rotten meat. Eng...

Jane Burton / Vet checking neck glands of Patterdale x Jack Russell Terrier, 8-week pup

Piotr Naskrecki / Sun Spider (Solifuga) does not have venom glands, their large chelicerae are strong enough to kill prey at least as big as themselves, South Africa

Piotr Naskrecki / Sun Spider (Solifuga) does not have venom glands, their large chelicerae are strong enough to kill prey at least as big as themselves, South Africa

Piotr Naskrecki / Sun Spider (Solifuga) does not have venom glands, their large chelicerae are strong enough to kill prey at least as big as themselves, South Africa

Nick Gordon / Matis Indians using poisonous toxin from captured Poison arrow frog (Dendrobates sp) to tip their hunting arrows, Amazonia, Brazil

Jane Burton / Lakeland Terrier x Border Collie scooting to relieve discomfort from its anal glands.

Mike Read / Detail of the scent gland on hind leg of a Sika deer (Cervus nippon) UK

Piotr Naskrecki / Sun Spider (Solifuga) does not have venom glands, their large mouthparts, or chelicerae, are strong enough to kill prey at least as big as themselves, diurnal, Botswana

Piotr Naskrecki / Sun Spider (Solifuga) does not have venom glands, their large mouthparts, or chelicerae, are strong enough to kill prey at least as big as themselves, diurnal, Botswana

Piotr Naskrecki / Weaver Ant (Oecophylla longinoda) worker pair with larvae which have silk-producing glands and if gently squeezed by workers, they can apply it to leaves like glue, Guinea, West Africa

Piotr Naskrecki / Cane Toad (Bufo marinus) the large swollen parotid glands behind the head of the cane produce a mixture of fourteen different toxins affecting the nervous system of any predator inexperienced enough t...

Mark Payne-Gill / Giant toad showing poison from glands {Bufo marinus} Townsville, Queensland, Australia

Mark Payne-Gill / Giant toad showing poison from glands {Bufo marinus} Townsville, Queensland, Australia

Philippe Clement / Elk stag {Cervus elaphus} rubbing tree bark with glands to place scent marks, Yellowstone NP, Wyoming, USA.

Kim Taylor / Honey Bee workers, underside showing abdomenal wax glands, UK.

Niall Benvie / White stork rubbing oil from gland {Ciconia ciconia} Latvia Europe

Mark Payne-Gill / Giant / Cane toad showing poison excreted from glands {Bufo marinus} Queensland,

Toby Sinclair / Musth gland on tusker Indian elephant {Elephas maximus} Gangaramaya Temple, Sri Lanka

Eric Baccega / Portrait of female Orang-utan (Pongo pygmaeus)nursing her young, captive. Native to Borneo,

Premaphotos / Dance fly (Hilara maura) male showing the enlarged front legs containing silk glands, UK

Premaphotos / Soft wing flower beetles (Malachius coccineus) The female on the right is feeding on excitators produced by glands on the male's face, Israel

Geoff Simpson / Grass snake {Natrix natrix} defends itself from predators by feigning death. Sometimes it also emits a foul-smelling substance from its anal glands, making it smell like rotten meat. Cromford, Derbysh...

PREMAPHOTOS / Giant / marine cane toads (Bufo marinus) pair in amplexus at night, with swollen poison glands behind the eyes, Trinidad

PREMAPHOTOS / Giant / marine cane toad (Bufo marinus) at night with swollen poison glands behind the eyes, Trinidad

Mark Payne-Gill / Giant toad showing poison from glands {Bufo marinus} Queensland Australia Townsville