Bluethroat. Museum specimen of a bluethroat (Luscinia svecica) as seen in ultraviolet (UV) light. In visible light, the male bluethroat has a blue and red coloured bib under the throat. The image shows how the blue mark reflects strongly in UV light. This image was taken using a digital camera adapted to only filter and detect UV light waves. Non UV-reflecting areas appear dark blue to mauve. Objects reflecting UV appear pale blue or light purple. Birds are able to detect four wavelengths of light (tetrachromatic vision). In addition to normal colour vision, they can detect wavelengths in the UV part of the electromagnetic spectrum which allows them to view plumage markings that are invisible to human eyes. (See image Z892/619 for...
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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