Results

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Property Organism Value Units ID Details
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...
Decrease in wildlife on Earth between 1970 and 2012 Biosphere ≤58 % 117265 Ceballos G, Ehrlich PR...
Fraction of 3,623 terrestrial invertebrate species and of 1,306 marine invertebrate species that are classified as threatened with extinction Invertebrates terrestrial species 42%: marine species 25% % 117264 Ceballos G, Ehrlich PR...
Fraction of land vertebrates including reptiles, birds, and amphibians that are experiencing a decline and losses in local population Biosphere ~30 % 117263 The Lancet Planetary...
Rate of species extinction in sixth (anthropocene) mass extinction compared to the “normal rate” throughout geological time Biosphere 100 times greater than “normal rate” 117262 Ceballos G, Ehrlich PR....
Plant species richness and fire-response traits in the five Mediterranean-type climate regions of the world Biosphere Table - link N/A 117261 Rundel PW et al., Fire...
Fraction of world vascular plant flora that Mediterranean-type climate (MTC) regions (covering only about 2.2% of world land area) are home to Biosphere 16.7 % of world vascular plant flora 117260 Rundel PW et al., Fire...