Mesoamerican Common Mustached Bat

Fascinating facts about the Mesoamerican Common Mustached Bat

• Long-range sonar pulses let this bat hunt in the dark like a tiny aircraft. During the search phase it emits CF-FM calls that last 22-25 ms and can carry up to four harmonics, with most energy in the second harmonic. Bats from the Yucatán Peninsula shift the constant-frequency component up to 63-5 kHz, while Costa Rican individuals average 60-5 kHz.
• When night falls, a few hundred of these bats gather in roosts that can swell to several hundred individuals. Researchers have recaptured individuals more than 2 km from where they were first tagged, showing they readily travel beyond their immediate foraging grounds.
• Pregnancy peaks in the hot caves of the Yucatán in late April and early May, when embryos measure 20-22 mm, while in Veracruz females can be found pregnant almost year-round, especially April-June and August-September. In Costa Rica, lactating mothers appear in February, with the bulk of nursing reported June-September, hinting at a possible second breeding wave.
• Inside the skull, the sella turcica, a tiny cup holding the pituitary gland, differs between Gulf-coast and Pacific-coast relatives. Measurements from 243 skulls show the dorsum sellae sits an average of 3.4 mm above the lower edge of the foramen magnum, forming a truncated pyramid with the processus clinoideus caudalis at its tip. Ten of the 20 measured dimensions vary significantly between the two regions.
• These bats weigh just 16-19 g and measure 70-72 mm from head to body, with forearms ranging 55-63 mm; Yucatán individuals sit at the lower end (55-56 mm) while Costa Rican and Panamanian bats reach the upper extreme (60-63 mm). Though they prefer warm caves, they can tolerate roost temperatures below 20 °C at the northern edge of their range, showing a broader thermal tolerance than smaller mormoopids. Their ability to thrive in both continuous forests and fragmented riparian corridors makes them a resilient generalist, they remain classified as Least Concern on the IUCN Red List.

At a glance

About the Mesoamerican Common Mustached Bat

In the twilight skies of Mesoamerica, the Common Mustached Bat emerges, its dark form silhouetted against the fading light as it embarks on a nocturnal hunt, navigating the dense foliage with an uncanny agility. With leathery wings beating at a hypnotic pace, this diminutive creature weaves through the trees, its high-frequency calls piercing the night air as it pursues the insect hordes that dance in the moon's silver glow. As it flits and darts, its remarkable ability to adapt to a wide range of habitats is a testament to the enduring resilience of this unassuming, yet fascinating, species.

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