Juergen Freund / Researcher Guido Westhoff looking at a cross section of pit organ tissue from a Coastal carpet python (Morelia spilota mcdowelli) through an electron microscope with 20,000 x magnification. Pit organs...

Alex Mustard / Brain coral (Colpophyllia natans) bleached, polyps have expelled their zooxanthellae symbiotic algae from their tissue, probably as a result of being stressed by a rise in sea temperature, East End,...

Juergen Freund / Researcher Guido Westhoff looking at a cross section of pit organ tissue from a Coastal carpet python (Morelia spilota mcdowelli) through an electron microscope with 20,000 x magnification. Pit organs...

GEORGETTE DOUWMA / Close up of mantle of Giant clam (Tridacna gigas) Colours come from symbiotic zooxanthellae in tissue, Misool, Raja Ampat, West Papua, Indonesia.

GEORGETTE DOUWMA / Mantle of Crocus giant clam (Tridacna crocea) colours come from symbiotic zooxanthellae in tissue, Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Undersea Explorer's crewwith grey reef shark (Carcharhinus amblyrhynchos) to collect tissue samples. North Horn, Queensland, Australia

Juergen Freund / Undersea Explorer's crew baiting grey reef sharks (Carcharhinus amblyrhynchos) to collect tissue samples. North Horn, Queensland, Australia

Juergen Freund / Vets taking tissue samples from pink salmon in hatchery, Canada

David Shale / Deepsea octopus (Bolitaena pygmaea) Ventral photophore in the female only is an area of yellow tissue around the mouth. Produces bioluminescence, deep sea Atlantic oceandeep sea

David Shale / Vibilia sp. (Hyperiidea, Vibiliidae). This is a genus that isn't too easy, even with a specimen under the microscope! This might be V. jeangerardi Lucas, 1845. The genus contains about 17 species, som...

Chris Newbert / Stargazer (Uranoscopus sp) hiding in sand, flaps of tissue that appear to be teeth keep sand out of mouth, 30 feet deep, Red Sea, Egypt

Norbert Wu / Hawksbill Sea Turtle (Eretmochelys imbricata) eating Organ Pipe Coral (Tubipora musica) with tissue burns from stinging coral around face, Papua New Guinea

Robert Thompson / Tissue moth (Triphosa dubitata) resting on branch, UK

Luciano Candisani / Humpback Whale (Megaptera novaeangliae) researchers collecting tissue samples, Abrolhos Islands, Bahia, Brazil

Suzi Eszterhas / Polar Bear (Ursus maritimus) researcher collects a tissue sample from three to four month old cub, vulnerable, Wapusk National Park, Manitoba, Canada