Chimpanzees (Pan troglodytes). Chimpanzee siblings hugging each other. The chimpanzee's natural habitat is the forest and forest edges of central and western Africa. It is social, living in large communities that may contain dozens of individuals arranged in loose family groups. The chimp is highly communicative, using a wide range of facial expressions, vocalisations and gestures. It feeds on a variety of foods including both plants and animals. It is thought that humans and chimps had a common ancestor as little as 5 million years ago.
© Tony Craddock/Science Photo Library
Boy measuring his temperature
MODEL RELEASED. Strip thermometer. Boy using a strip thermometer to measure his temperature from his forehead. His temperature is displayed by the green area, which in this case shows 38 degrees Celsius. This indicates that he has a slight fever: normal body temperature is a degree lower than this. The cells in the strip each contain liquid crystals in a tight helix. The crystals are designed so that they expand and begin to reflect light at a specific activation temperature. Each cell's crystals have a slightly different activation temperature. Fevers can be reduced with drugs, but most are short-lived and harmless. Skin thermometers are less accurate than mercury or digital types.
© ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY
Olive baboons (Papio anubis), also known as Anubis baboons are sociable animals living in groups of up to several hundred individuals. They are found throughout sub-Saharan Africa and also in some mountain areas of the Sahara. Their diet consists mainly of grasses, fruits, insects and small mammals.
© Dr P.Marazzi/Science Photo Library