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Size varies considerably in different regions, with average weight from 0.7 to 2.4 kg (1 lb 9 oz to 5 lb 5 oz); males have average length 50 cm (20 in), while females are the smaller at 43 cm (17 in). [21]
Platypus (Ornithorhynchus anatinus) 52 Ten sex chromosomes. Males have X 1 Y 1 X 2 Y 2 X 3 Y 3 X 4 Y 4 X 5 Y 5, females have X 1 X 1 X 2 X 2 X 3 X 3 X 4 X 4 X 5 X 5. [83] [84] 139 Upland cotton (Gossypium hirsutum) 52 This is for the cultivated species G. hirsutum (allotetraploid, 2n=4x=52). This species accounts for 90% of the world cotton ...
Below are two tables which report the average adult human height by country or geographical region. With regard to the first table , original studies and sources should be consulted for details on methodology and the exact populations measured, surveyed, or considered.
The platypus has an average body temperature of about 31 °C (88 °F) rather than the averages of 35 °C (95 °F) for marsupials and 37 °C (99 °F) for placentals. [ 30 ] [ 31 ] Research suggests this has been a gradual adaptation to the harsh, marginal environmental niches in which the few extant monotreme species have managed to survive ...
A platypus bill has three different types of receptor cells that allow the mammal to detect movement, and also the electric fields produced by the small creatures it hunts.
Platypus numbers may have more than halved over several decades, research models show, but figures are hard to pinpoint. Environment groups estimate the total population between 30,000 and 300,000.
The average lifespan of an echidna in the wild is estimated at 14–16 years. Fully grown females can weigh about 4.5 kilograms (9.9 lb), the males 33% larger, at about 6 kilograms (13 lb). [ 12 ] Though the internal reproductive organs differ, both sexes possess an identical single cloaca opening for urination, defecation, and mating.
The brain and central nervous system have been extensively studied for evolutionary comparison with placental mammals, particularly with its fellow monotreme, the platypus. [67] [68] The average brain volume is 25 ml (0.88 imp fl oz; 0.85 US fl oz), similar to a cat of approximately the same size; [69] while the platypus has a largely smooth ...