Albert Lleal / Microchip and needle used to inject sea turtles for marking and tracking data, Barcelona, Spain

Marie Read / Backyard setup for photographing Ruby-throated Hummingbirds (Archilocus colubris) in summer, New York, USA. A medical syringe is used to inject a few drops of sugar solution into the flower (set up in...

Nick Upton / Veterinarian Dewi Jones preparing to inject antibiotics into a sick Holstein Friesian cow (Bos taurus) held in a crush, Gloucestershire, UK, September 2014. Model released.

Jeff Rotman / Aquarium Scientists inject antibiotic into Zebra shark (Stegostoma fasciatum) in aquarium, Manly Oceanworld, Sydney, New South Wales, Australia.

Neil Bromhall / Common mussel {Mytilus edulis} holding down Dogwhelk {Nucella lapillus} with byssal in order to feeds on it. Dogwhelk may then drill into mussel shell and inject poisonous solution to feed on mussel.

Gil Wizen / Chalcidid wasp (Chalcididae) preparing to inject eggs into a Hawkmoth (Sphingidae) caterpillar, Mindo, Ecuador.

Nigel Cattlin / Photomicrograph of stinging hairs, spicules or trichomes of a Stinging nettle (Urtica dioica), Devon, England, UK, June

Nigel Cattlin / Photomicrograph of stinging hairs, spicules or trichomes of a stinging nettle (Urtica dioica), Devon, England, UK, June