- The Large-footed Myotis (Myotis macropus), also known as the Large-footed Mouse-eared Bat, is a remarkable species of vesper bat native to Australia, Indonesia, and Papua New Guinea. This specialized bat has developed unique adaptations for hunting aquatic prey.
- The species is distinguished by its notably large feet, measuring between 10-13 millimeters, which are proportionally larger than those of other Myotis species. These enlarged feet, equipped with sharp, curved claws, are essential for their distinctive hunting technique. The bat’s fur is typically dark brown to reddish-brown on its dorsal surface, while the ventral side displays a lighter, grayish-brown coloration. Adults typically weigh between 7-12 grams and have a wingspan of approximately 25-30 centimeters.
- Myotis macropus exhibits remarkable hunting behavior, flying low over water bodies to detect ripples created by small fish and aquatic insects using echolocation. When prey is located, they use their large feet and claws to gaff prey from the water’s surface, sometimes even dipping their entire body briefly into the water. Their fur is water-resistant, an adaptation that supports this hunting strategy.
- These bats show a strong preference for habitat near slow-flowing rivers, streams, and lagoons, particularly where the water surface is smooth and clear of vegetation. They roost in small colonies, typically in caves, tree hollows, or human structures near water bodies. Roosting sites are usually within a few hundred meters of their foraging areas.
- The breeding cycle of M. macropus aligns with seasonal patterns. Females generally give birth to a single pup during the Australian spring or early summer (October to December). The young are nursed for several weeks until they develop the ability to fly and hunt independently.
- Conservation concerns for this species include habitat degradation, particularly the pollution and modification of waterways, as well as the clearing of roosting sites. While currently not considered threatened, their dependence on healthy aquatic ecosystems makes them vulnerable to environmental changes and water quality deterioration.
- Their echolocation calls typically range between 40-80 kHz, with most energy around 60 kHz. This high-frequency sonar system allows them to detect small ripples and prey movement on the water’s surface with remarkable precision, making them highly successful aquatic hunters.
