Buffalo roaming on the QB Ranch in West Texas. Courtesy Of Wayne Kirk hide caption

itoggle caption Courtesy Of Wayne Kirk

DNA analysis showed that most dogs share genetic markers with Middle Eastern gray wolves, like this one photographed in Israel. Courtesy of Nadav Perez hide caption

itoggle caption Courtesy of Nadav Perez

African elephants are expected to be at the center of a contentious debate about ivory sales at next week's CITES meeting. Delegates will try to resolve disputes about other animals, including bluefin tuna and hammerhead sharks. Dan Kitwood/Getty Images hide caption

itoggle caption Dan Kitwood/Getty Images

A genetic abnormality causes this chicken to exhibit both male and female characteristics. The right (white) side is typical of males and the left (brown) side is typical of females. The Roslin Institute at the University of Edinburgh hide caption

itoggle caption The Roslin Institute at the University of Edinburgh

Chameleons, such as this Chamaeleo calyptratus, feed by way of ballistic tongue projection, which launches their tongues at prey with a rapid burst of speed. Cold temperatures do not slow their tongues down, allowing chameleons to catch meals even when the temperature drops. Courtesy of Christopher V. Anderson hide caption

itoggle caption Courtesy of Christopher V. Anderson

The byssal threads help these mussels hang on to rocky outcroppings and might suggest a new way of making flexible but strong materials for industrial uses. jeffk/via flickr hide caption

itoggle caption jeffk/via flickr

As temperatures drop during the winter months, female mosquitoes like Culex pipiens gain weight to conserve energy. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A life-sized reconstruction of the moment just before the dinosaur hatching and snake were preserved. The scales and patterning of the snake's skin is based on its modern relatives. The coloration of the hatchling is the artist's interpretation. Sculpture by Tyler Keillor/Photo by Ximena Erickson/Image modified by Bonnie Miljour hide caption

itoggle caption Sculpture by Tyler Keillor/Photo by Ximena Erickson/Image modified by Bonnie Miljour