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In the U.S. state of Colorado 519 species of birds have been documented as of September 2022 according to the Colorado Bird Records Committee (CBRC) of Colorado Field Ornithologists. [ 1 ] This list is presented in the taxonomic sequence of the Check-list of North and Middle American Birds , 7th edition through the 63rd Supplement, published by ...
The northern cardinal is the state bird of six states, followed by the western meadowlark also the state bird of six states. The District of Columbia designated a district bird in 1938. [4] Of the five inhabited territories of the United States, American Samoa and Puerto Rico are the only ones without territorial birds.
The average global population of all mature birds is estimated to be on the order of 100 billion individuals. [1] [2] [3] The total population including younglings is somewhat higher during the breeding season of each species. [3] This list is incomplete, because experts have not estimated all bird numbers.
Order: Anseriformes Family: Anatidae. A female mallard. Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans. These birds are adapted to an aquatic existence with webbed feet, bills which are flattened to a greater or lesser extent, and feathers that are excellent at shedding water due to special oils.
The taxonomic treatment [3] (designation and sequence of orders, families and species) and nomenclature (common and scientific names) used in the accompanying bird lists adheres to the conventions of the AOS's (2019) Check-list of North American Birds, the recognized scientific authority on the taxonomy and nomenclature of North America birds.
Range expansions are important because they often signal changing habitats, whether the reason can be explained by natural causes or more often human aided causes. Avian range expansion can produce considerable effects in both the population numbers of the invaded species as well as numbers of hybrid species created.
Last week, Colorado reported four confirmed infections of H5N1 bird flu and was checking on the status of a fifth suspected case. The two new cases were in poultry workers with exposure to ...
It was the fourth human case of bird flu reported in the U.S. since avian flu was confirmed in cows in March. The prior three people to test positive were also dairy farm workers who recovered.