Spix's Disk-winged Bat (Thyroptera tricolor) lives in tropical rainforest across Central and South America. Its conservation status is Least Concern.
Fascinating facts about the Spix's Disk-winged Bat
- Its thumbs and hind-feet bear circular disks that act as suction cups, letting it cling to and move across smooth surfaces. The disks form concave cups backed by an internal cartilaginous plate, and when the flexor muscle contracts the cup shape changes to create suction. To keep the adhesive surface functional the bat frequently licks the disks, and abundant sweat glands keep them moist.
- Unlike most bats, this species hangs with its head upward while roosting. This head-up posture is seen in only six bat species across the genera Thyroptera and Myzopoda, making it a rare behaviour. The bat seeks the bud of a rolled-up leaf that opens at the top and clings to the smooth inner surface, a position that allows a rapid escape if disturbed. Roosting head-up therefore complements its specialised adhesive disks.
- It roosts inside the smooth inner walls of rolled-up leaves such as Heliconia and Calathea, and the number of suitable leaves limits how many bats can live locally. Species abundance may be limited by the availability of these roosting sites, unlike other bats that gather in caves or hollow trees. tricolor is adapted to furled leaves, a scarcity of plants with this leaf morphology can cap local populations.
- The disk-winged bat's adhesive disks are not limited to a single orientation; it can cling to surfaces at any angle, whether vertical, horizontal or inverted. This contrasts with the Madagascar sucker-footed bat, which can attach only head-up. The ability to grip any surface lets the bat secure itself inside the smooth inner walls of rolled-up leaves, even on the underside of the leaf tube. Such flexibility aids rapid escape when the leaf is disturbed.
- The forearm of Spix's disk-winged bat measures just 36-37 mm, with females averaging 37 mm and males 36 mm, showing almost identical wing-bone lengths between the sexes. Despite this tiny size, adults weigh only about 4 g. These compact dimensions support agile flight just a few metres above the forest floor as the bats hunt insects. Their small forearms also enable them to manoeuvre into the narrow buds of rolled-up leaves where they roost.
Sources
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At a glance
RangeCentral and South America
HabitatTropical rainforest
DietInsects and fruit
About the Spix's Disk-winged Bat
In the warm, humid depths of the tropical forest, the Spix's Disk-winged Bat dances through the shadows, its delicate, almost translucent wings beating at a hypnotic pace as it pursues the insects that comprise its nocturnal feast. With each flutter, the disk-like pads on its thumbs make barely audible contact with the leaves, a gentle tapping that belies the bat's incredible agility and speed as it navigates the dense undergrowth. As it flits and weaves, its large, round eyes shine like dark jewels, drinking in the faint moonlight that filters through the canopy above.
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