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[1] Counting has traditionally been considered an ability that shows intelligence. Anecdotal evidence from the 1960s has suggested that crows can count up to 3. [2] Researchers need to be cautious, however, and ensure that birds are not merely demonstrating the ability to subitize, or count a small number of items quickly.
The first list shows number of neurons in their entire nervous system. The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence. [1] The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex. [2] [1]
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.
The birds were tested on their ability to distinguish benign from malignant human breast histopathology images and could even apply what they had learned to previously unseen images. However, when faced with a more challenging task, they reverted to image memorisation and thus showed little generalisation to novel examples.
In total there are about 10,000 species of birds described worldwide, though one estimate of the real number places it at almost twice that. [1] The order passerines (perching birds) alone accounts for well over 5,000 species. Taxonomy is very fluid in the age of DNA analysis, so comments are made where appropriate, and all numbers are approximate.
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First are listed birdwatchers with large life lists, which is based on the number of species of birds each of them has/had seen. Depending on the taxonomic viewpoint, there are 10,858 ( Clements V2023 ) or 11,032 ( IOC ver. 14.1 ) living bird species recognised.
In this list of birds by common name 11,278 extant and recently extinct (since 1500) bird species are recognised. [1] Species marked with a "†" are extinct. Contents