47. 1 The Biodiversity Crisis - Biology - OpenStax Current Species Diversity Despite considerable effort, knowledge of the species that inhabit the planet is limited A recent estimate suggests that the eukaryote species for which science has names, about 1 5 million species, account for less than 20 percent of the total number of eukaryote species present on the planet (8 7 million species, by one estimate)
Endangered Species - U. S. Fish and Wildlife Service We provide national leadership in the recovery and conservation of our nation's imperiled plant and animal species, working with experts in the scientific community to identify species on the verge of extinction and to build the road to recovery to bring them back We work with a range of public and private partners to protect important habitat, and increase species' populations and reduce the
29 Introduction to Vertebrates – General Biology In fact, they were the dominant terrestrial animals for 150 million years, until most of them died out in a mass extinction near the end of the Cretaceous period (except for the feathered theropod ancestors of modern birds, whose direct descendents now number nearly 10,000 species)
12 Most Common Bird Species Worldwide: A Comprehensive Guide . . . The domestic chicken (Gallus gallus domesticus) is the most numerous bird species on Earth, with an estimated population of 24 billion as of 2023 Which wild bird species has the largest population? The red-billed quelea (Quelea quelea) is considered the most abundant wild bird species, with an estimated population of 1 5 billion breeding birds
Phylogenetic Trees and the Future of Mammalian Biodiversity The end-Pleistocene mass extinction of mammals removed mostly large species (Barnosky, Chapter 12, this volume), and declining mammals are an order of magnitude heavier, on average, than are non-threatened species (Cardillo et al , 2005) There are several possible reasons: Large-bodied species are more tempting targets than small ones for
Science for Saving Species Australian birds and mammals In general, the information available for threatened species in these groups is more substantial than for other threatened species in other groups (such as fish or insects) However, even for the relatively well-known groups such as birds and mammals, there are significant information gaps – in knowledge