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Bison are large, even-toed ungulates in the genus Bison within the subfamily Bovinae.
Two extant and six extinct species are recognised. Of the six extinct species, five became extinct in the Quaternary extinction event. Bison palaeosinensis evolved in the Early Pleistocene in South Asia, and was the evolutionary ancestor of B. priscus (steppe bison), which was the ancestor of all other Bison species. From 2 million years ago to 6,000 BC, steppe bison ranged across the mammoth steppe, inhabiting Europe and northern Asia with B. schoetensacki (woodland bison), and North America with B. antiquus, B. latifrons, and B. occidentalis. The last species to go extinct, B. occidentalis, was succeeded at 3,000 BC by B. bison.
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- Higher bit depths (more colors) PNG allows for 1, 2, 4, 8, 16, 24 and 32 bit images, smashing the 8-bit barrier
- A permanent, royalty-free license PNG is being developed by the W3C, and will always be a free and open standard
- Multiple layers of transparency Bison PNG images allow for full alpha channel transparency, which makes moving images from one background to another easy.
- Uses a lossless image compression technique, hence no information is lost and the image is retrieved keeping the same quality.
- Supports all the true colors, unlike the contemporary GIF format which only supports 256 colors.
- Alpha channel support in PNG images allows transparency of the file format which is not possible with other file formats.