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The larger average body size of megabats compared to ... compared to 40% of adult body mass in non-bat ... The virus can pass from a bat host to a human ...
The hammer-headed bat is the largest bat in mainland Africa. [12] Males have wingspans up to 90.1 cm (2.96 ft), [ 13 ] and all individuals have forearm lengths exceeding 112 mm (4.4 in). [ 12 ] It has pronounced sexual dimorphism , more so than any other bat species in the world, [ 12 ] with males up to twice as heavy as females.
It is among the heaviest of all bat species, with individuals weighing up to 1.40 kg (3.1 lb). The only bat species known to weigh more than the giant golden-crowned flying fox are the Indian flying fox (Pteropus medius) and great flying fox (Pteropus neohibernicus), with a maximum weight of 1.6 kg (3.5 lb) and 1.45 kg (3.2 lb) respectively.
The megabats, including flying foxes, have the greatest encephalization quotient (brain size relative to body size) of any bat family at 1.20. [20] This value is equivalent to that of domestic dogs. [21] Flying foxes display behaviors that indicate a reliance on long-term information storage.
Spotted-winged fruit bats are unusually small megabats, with a head-body length of 5.2 to 6.2 centimetres (2.0 to 2.4 in), [2] a wingspan of 28 centimetres (11 in), and an adult body weight of around 13 grams (0.46 oz).
Therefore, compared to a terrestrial mammal of the same relative size, the bat's heart can be up to three times larger, and pump more blood. [80] Cardiac output is directly derived from heart rate and stroke volume of the blood; [ 81 ] an active microbat can reach a heart rate of 1000 beats per minute .
Townsend's big-eared bat is a medium-sized bat (7–12 g) [2] with extremely long, flexible ears, and small yet noticeable lumps on each side of the snout. Its total length is around 10 cm (4 in.), its tail being around 5 cm (2 in) and its wingspan is about 28 cm (11 in).
Microbat calls ⓘ range in frequency from 14,000 to over 100,000 hertz, well beyond the range of the human ear (typical human hearing range is considered to be from 20 to 20,000 Hz). The emitted vocalizations form a broad beam of sound used to probe the environment, as well as communicate with other bats.