Classification

Dinosaur communities were separated by both time and geography. The 'age of dinosaurs' (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of...
Approximately 700 species have been named. However, a recent scientific review suggests that only about half of these are based on fairly complete specimens that can be shown to be unique and separate species. Also, even if all of the roughly 700...
Figuring out ways to estimate animal population sizes and their trends involves a lot of research time at the USGS Patuxent Wildlife Research Center. As you probably know, animals do not particularly want to be counted and it becomes quite a tricky...
Bird banding data are useful in both research and management projects. For example, individual identification of birds allows for possible studies of dispersal and migration, behavior and social structure, life-span and survival rate, reproductive...
The term "historical" as used in the GNIS means specifically and only that the feature no longer exists on the landscape. It has no reference to age, size, condition, extent of habitation, type of use, or any other factor. For example, a ghost town is...