The Center for Biological Diversity added the mountain-dwelling pika to the animals that should be listed as endangered by the U.S. Fish and Wildlife Service.
More than 100 people gathered in Kane County, Utah, to see fossilized footprints pressed into the sandstone by dinosaurs 185 million years ago.
NASA said Monday validation tests have been completed on cameras and sensors made for searching for water on the Earth's moon.
Whether you are dealing with the number of wildebeest on the Serengeti or the number of malaria parasites in the human body, new research shows the same ecological framework determines breeding numbers and population size.