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Sturnira lilum - Maricá | by Ilan Ejzykowicz
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Sturnira lilum - Maricá

Little yellow-shouldered bats are found in the neotropics, ranging from North Mexico (including Sonora and Tamaulipas) through Central America and tropical and subtropical South America to Chile. This includes northern Argentina, eastern and southern Brazil, and the Lesser Antilles. (Gannon, et al., 1989; Mello, et al., 2008; Stoner, 2001; Vieira and Carvalho-Okano, 1994; Wilson and Reeder, 2005)


Little yellow-shouldered bats are medium-sized bats with total lengths of 62 to 65 mm, forearm lengths of 36.6 to 45.0 mm, and average wingspan of 30 cm (Vieira and Carvalho-Okano, 1994). Males tend to have slightly larger total length and cranial measurements than females (Gannon et al., 1989). Typical mass is 13 to 18g (Evelyn and Stiles, 2003). They have short, broad ears with a tragus that is one-third the size of the ear. They also have distinct nose leaves. No tail is present and calcars are extremely small or absent. Coloring varies by gender, age, and geography. Dorsal fur can be dark gray to reddish-brown and the ventral fur is always lighter than the dorsal fur. The head, neck, and shoulder hairs have a yellow tint due to yellow hair shafts and with dark-brown tips. Males tend to have yellow to red stained shoulder hairs that look like straps on a soldier’s uniform due to an excretion from their shoulder glands. It is this coloring that gives S. lilium the common name "little yellow-shouldered bat." The patagia is solid brown (Gannon et al., 1989). (Evelyn and Stiles, 2003; Gannon, et al., 1989; Nowak, 1991; Vieira and Carvalho-Okano, 1994)


Little yellow-shouldered bats are homoiothermic, with an average body temperature of 36.4 degrees Celsius and a range from 34 to 38 degrees Celsius. They have been known to survive with a body temperature of 41 degrees Celsius (Gannon et al., 1989). (Gannon, et al., 1989)

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Taken on June 4, 2012