David Attenborough, British naturalist
David Attenborough. Caricature of the British naturalist and broadcaster Sir David Frederick Attenborough (born 1926) holding a frog. Attenborough is most famous for the numerous BBC television nature documentaries he has presented. In the 1960s and 1970s he was controller of BBC Two and director of programming for BBC Television. His awards include Commander of the Order of the British Empire (1974), Fellow of the Royal Society (1983), Knight Bachelor (1985), Commander of the Royal Victorian Order (1991), Companion of Honour (1996) and the Order of Merit (2005).
© GARY BROWN/SCIENCE PHOTO LIBRARY
Red-eyed tree frog
Red-eyed tree frog (Agalychnis callidryas) climbing through foliage. This frog is found in the tropical rainforests of central America. As its name implies, it lives in trees and other vegetation. Each toe ends with a sucker, which is used to grasp leaves and stems. It is primarily nocturnal, and feeds mainly on insects such as moths, grasshoppers and flies. It has been known to eat smaller frogs. It can reach a length of around seven centimetres. Its bold colouration has made this frog popular in the pet trade.
© DAVID AUBREY/SCIENCE PHOTO LIBRARY
Eukaryotic cell structure, SEM
Eukaryotic cell structure. Coloured scanningelectron micrograph (SEM) of endoplasmic reticulum(ER, red and blue) and microtubules (yellow)inside a cell. ER, a membrane-bound organelle, isthe site of lipid synthesis and the production ofmembrane-bound proteins. Microtubules are proteinfilaments that form part of the cell cytoskeleton.The cytoskeleton gives the cell its shape and thecapacity for directed movement.
© Dr Elena Kiseleva/Science Photo Library