Results
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| Property | Organism | Value | Units | ID | Details |
|---|---|---|---|---|---|
| Ratio between number of species of birds and mammals in tropical regions and temperate regions | Biosphere | 2 | Unitless | 103929 | May RM. How Many Species... |
| 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... |
| Fraction of scleractinian corals, amphibians, birds and mammals that are classified as 'threatned' as of 2011 | Metazoa animals | 20 - 43 | % | 112755 | Barnosky AD et al., Has... |
| Extinction rates calculated by cohort analysis and fractions of species that are critically endangered (CR) | vertebrates | Table - link | N/A | 113448 | Pimm SL et al., The ... |
| Plasma volume | vertebrates | marine birds ~5%-7%: terrestrial birds 3%-5%: usual range in mammals ~5% | % of body weight | 113048 | Erik Skadhauge, 1981... |
| Estimated time range of diversification of chicken and zebra finch | Various | 66e+6 - 86.5e+6 | years | 105158 | Donoghue PC, Benton MJ.... |
| Bone mass as a fraction of the total body mass | Ostrich Struthio camelus | 9 | % | 108639 | Brian Cotterell, Fracture... |
| Number of bird specimens on Earth | Biosphere | 200 - 400 | billion (10^9) birds | 116940 | Kevin J. Gaston & Tim... |
| 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... |
| Total body water (TBW) | Glaucous-winged Gull Larus glaucescens | 1st study [Ruch & Hughes (1975)] 79%: 2nd study [Walter & Hughes (1978)] 88% | % | 113050 | Sheila A. Mahoney & Joseph... |
| Haematocrit | Chicken Gallus gallus | body weight of ≤1800 g for both sexes ~30%: hens/roosters of higher body weight ~30%/nearly 50% | % | 113049 | Erik Skadhauge, 1981... |
| Population size (most numerous undomesticated bird on earth) | Red-billed quelea Quelea quelea | ~1.5 | billion individuals | 117284 | Bennett CE et al., The... |
| 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... |
| Red blood cell dimensions (elliptical shape) | Chicken Gallus gallus | 7.3 short diameter: 12.1 long diameter | µm | 102925 | http://www.genomesiz... |
| The amphibian tree of life | Amphibians | Table - link | number of species for major clades | 117258 | Wake DB, Koo MS. Amphibians.... |
| Net change in abundance across the North American avifauna, 1970-2017 | Biosphere | Table - link | N/A | 117282 | Rosenberg KV et al.,... |
| Diversification rate | Eukaryotes | plants 0.06: birds 0.15: various chordates 0.2: arthropods 0.17: mammals 0.07 | new species/species/million years | 113447 | Pimm SL et al., The ... |
| Standard screening threshold of sequence difference in cytochrome c oxidase I (COI) gene to define different species | Metazoa animals | 10 | × (times) average intraspecific difference | 113002 | Hebert PD, Stoeckle MY... |
| Decrease in bird population size in North America since 1970 | Biosphere | 29 | % | 117279 | Rosenberg KV et al.,... |
| Overall pan-genomic background substitution rate | Vertebrates | birds ~0.0019: mammals ~0.0027 | substitutions/site/million years | 117106 | Zhang G et al., Comparative... |