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Property Organism Value Units ID Details
Domestication date Chicken Gallus gallus ~8,000 years ago 117285 Bennett CE et al., The...
Population size (most numerous undomesticated bird on earth) Red-billed quelea Quelea quelea ~1.5 billion individuals 117284 Bennett CE et al., The...
Net change in abundance across North American bird families, 1970-2017 Biosphere Table - link N/A 117283 Rosenberg KV et al.,...
Net change in abundance across the North American avifauna, 1970-2017 Biosphere Table - link N/A 117282 Rosenberg KV et al.,...
Net population change in North American birds Biosphere Table - link % change since 1970 117281 Rosenberg KV et al.,...
Gains and losses across the North American avifauna over the last half century Biosphere Table - link N/A 117280 Rosenberg KV et al.,...
Decrease in bird population size in North America since 1970 Biosphere 29 % 117279 Rosenberg KV et al.,...
Number of species of parasitic worms and protozoa that humans are host to Human Homo sapiens parasitic worms ~300: protozoa >70 species 117278 Cox FE. History of human...
Number of times obligate interspecific brood parasitism arose independently during evolution Birds 7 times 117277 Stevens M. Bird brood...
Number of species in which intraspecific (same-species) brood parasitism has been reported Birds ~200 bird species 117276 Stevens M. Bird brood...
Fraction of all species that are obligate brood parasites Birds ~1 % of all bird species 117275 Stevens M. Bird brood...
Total number of species Biosphere ~9 - 52 million species 117274 Khan S et al., Overview...
Number of bird species that became extinct in tropical oceania islands in approximately 2000 years, since human colonization Biosphere 1800 bird species 117273 Khan S et al., Overview...
Current (sixth, or anthropocene) extinction rates compared to natural background rates of extinction Biosphere current 1,000: future likely to be 10,000 times higher than background extinction rate 117272 Khan S et al., Overview...
Number of species going extinct per day in the sixth (anthropocene) extinction Biosphere ≤150 species/day 117271 Kaebnick GE, Jennings...
Number of described species Invertebrates ~1.4 million species 117270 Régnier C et al., Mass...
Fraction of the 1.9 million known recent species that are recorded as extinct Biosphere 0.04 ((799 species)) % 117269 Régnier C et al., Mass...
Fraction of number of individual animals that once shared the Earth with humans that are extinct Biosphere ≤50 % of individual animals 117268 Ceballos G, Ehrlich PR...
Fraction of insect species per taxonomic order that have contracting ranges in the UK Biosphere 30 - 60 % of species per taxonomic order 117267 Ceballos G, Ehrlich PR...
Percentage of decreasing species classified by IUCN (International Union for Conservation of Nature) as "endangered" or "low concern" in terrestrial vertebrates Vertebrates Table - link % 117266 Ceballos G, Ehrlich PR...