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Insectivorous bats may eat over 120 percent of their body weight per day, while frugivorous bats may eat over twice their weight. [148] They can travel significant distances each night, exceptionally as much as 38.5 km (24 mi) in the spotted bat ( Euderma maculatum ), in search of food. [ 149 ]
The "bat drop" of a bat is its weight, in ounces, minus its length, in inches. For example, a 30-ounce, 33-inch-long bat has a bat drop of minus 3 (30 − 33 = −3). Larger bat drops help to increase swing speed, due to less mass per unit length; smaller drops create more power, due to greater momentum to transfer to the ball. [citation needed]
Like all bats in the United States, [54] big brown bats can be affected by rabies. The incubation period for rabies in this species can exceed four weeks, [55] though the mean incubation period is 24 days. [54] Rabid big brown bats will bite each other, which is the primary method of transmission from individual to individual.
The little brown bat is a small species, with individuals weighing 5.5–12.5 g (0.19–0.44 oz) with a total body length of 8.0–9.5 cm (3.1–3.7 in). Individuals have the lowest weight in the spring as they emerge from hibernation. It has a forearm length of 36–40 mm (1.4–1.6 in) and a wingspan of 22.2–26.9 cm (8.7–10.6 in). [17]
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 large flying fox has the longest forearm length and reported wingspan of any bat species, [3] but some bat species exceed it in weight. Its wingspan is up to 1.5 m (4 ft 11 in), and it can weigh up to 1.1 kg ( 2 + 1 ⁄ 2 lb). [ 12 ]