Zebrafish muscle. Confocal light micrograph of the interior of an intact zebrafish (Danio rerio) larva. The tissues have been stained with fluorescent dyes and illuminated with a laser: cell nuclei appear yellow. The long, dark, striated objects are individual muscle cells. A confocal microscope detects light only from the focal point of its objective lens. By moving the focal point, sharp images of thin sections of an intact specimen can be obtained. Magnification: x200 at 6x6cm size.
© Stefanie Reichelt/Science Photo Library
Burchells zebra with foal
Burchell's zebra (Equus burchelli) mother and foal at a watering hole. Zebra are wild horses that live on the vast open plains of eastern Africa. Burchell's zebra is also called the plains zebra. It lives in herds of several hundred individuals and each herd's territory may cover several square kilometres. The zebra has a gestation period of around one year, and the foal stays with its mother's herd. It is an important prey animal for large carnivores such as lions, but can run fast for long distances, and can put up a powerful fight if they are caught. Photographed in Mkhuzi, South Africa.
© PETER CHADWICK/SCIENCE PHOTO LIBRARY
Dugong, remora and golden trevallies
Dugong (Dugong dugong) with a remora (Echeneis naucrates) attached at its rear and juvenile golden trevallies (Gnathanodon speciosus) swimming in front. The dugong is a herbivorous marine mammal found in shallow, tropical waters throughout the Indo-Pacific region. It can grow to three metres in length and 400 kilograms in weight. Remoras have a symbiotic relationship with large sea animals. They use a sucking disk on the top of their heads to attach to their host. They clean the host's skin of parasites and the host's presence protects the remoras from predators. The golden trevallies swim in front of harmless sea animals to be pushed along by the animal's propulsion. Photographed in the Red Sea, Egypt.
© Alexis Rosenfeld/Science Photo Library