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Spix's Disked-winged Bat Thyroptera tricolor 
Size: body=4 cm; tail=3 cm; weight=4 g Description: Very small and delicate bat with long fluffy fur. Upperparts dark brown and underparts whitish. Extensive membrane between legs with long tail extending just beyond the edge. Suction cups on thumbs and heels. Activity: Their flight is quite agile and manoeuvrable making them difficult to catch in nets. Habits: Probably catches small insects in flight. Roosts upright in furled Heliconia leaves and uses suction-cup-like disks on wrists and ankles to move along the slick surface. New roost sites are found almost everyday as the leaves unroll and open. Up to 9 bats live in a roost. Habitat: Lowland rainforest. Status: Uncommon. Distribution in Iwokrama | |
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Black Myotis Myotis nigricans 
Size: body=4.5 cm; tail=3 cm; weight=5 g Description: Small blackish bat. Long tail completely enclosed in membrane between legs. Activity: Nocturnal. Bats begin to leave their day roost at sunset and usually do not return until after dawn. Habits: Eat moths and other small insects, resting at temporary roosts during the night. In the day, roosts in tree hollows, caves, and buildings. Habitat: Lowland rainforest. Status: Common. Distribution in Iwokrama | |
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Black Bonneted Bat Eumops auripendulus 
Size: body=8 cm; tail=4 cm; weight=30 g Description: Large, brownish black bat. Ears extend over flat face to tip of nose. Long tail extends well beyond tail membrane (this is why it belongs to the group with the common name "free-tailed bats"). Activity: High-flying aerial insectivore. Habits: Feeds on large insect prey. Roosts in small groups in tree hollows and buildings. Habitat: Rainforest and clearings. Status: Often common. Distribution in Iwokrama | |
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Common Mastiff Bat Molossus rufus 
Size: body=8.5 cm; tail=4 cm; weight=30 g Description: Small greyish or reddish brown bat with bases of hair white on back. Head ridge-shaped along the top. Tail is long and extends past membrane (one of the "free-tailed" bats). Activity: Begins foraging at sunset, usually high up in open areas. Habits: Feeds on insects, primarily beetles. Roosts in colonies of up to 300 in buildings and tree hollows. Habitat: Lowland forest, open areas including towns and villages. Status: Often common. Distribution in Iwokrama | |
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