Silky Short-tailed Bat

The Silky Short-tailed Bat is a small, common frugivorous bat found in Neotropical forests of northern and western South America. It is named for its notably short tail and soft, silky fur texture. This species plays an important ecological role as a seed disperser in tropical ecosystems. It is one of several closely related Carollia species that are abundant and easily captured in mist-net surveys.

Northern and western South America, including Ecuador, Peru, Colombia, Venezuela, and Bolivia, extending into parts of Central America.

Ranges from Costa Rica and Panama in Central America through Colombia, Venezuela, Ecuador, Peru, and Bolivia in South America. It is particularly common in Andean foothill and Amazonian forest regions.

Altitude and depth

Found from sea level up to approximately 2000-2500 meters, with higher abundance in mid-elevation cloud forests compared to some congeners.

Seasonal movements

No true hibernation or long-distance migration is documented, but reproductive activity may show seasonal peaks correlated with fruit availability and rainfall patterns.

Primarily found in tropical and subtropical moist lowland and montane forests, including secondary growth and forest edges. It also occupies disturbed habitats such as plantations and agricultural areas near forest cover.

Adaptations to its environment

Possesses strong jaw muscles and specialized teeth for processing fruit pulp, along with excellent echolocation for navigating dense forest understory. Its short tail and broad wings aid maneuverability in cluttered vegetation.

Listed as Least Concern (LC) by the IUCN due to its wide distribution, large population size, and tolerance of some habitat disturbance.

Estimated population

No precise global population figure exists, but the species is considered abundant and stable across most of its range based on frequent capture rates in field studies.

Localized threats include deforestation, habitat fragmentation, and agricultural expansion, though the species' adaptability to disturbed habitats buffers it from severe decline.

Diseases and parasites

Known to host various ectoparasites such as bat flies (Streblidae) and mites, as well as being a potential reservoir for certain viruses studied in bat virology research.

Benefits indirectly from protected areas and national parks within its range, such as reserves in the Amazon and Andean foothills; no species-specific conservation programs are currently in place.

Recommended actions

Continued protection of tropical forest habitat, monitoring of population trends in fragmented landscapes, and further taxonomic research to clarify species boundaries within the genus Carollia.

The fur is soft and silky, ranging from brown to grayish-brown, with a paler underside. It has a distinctive short tail that barely extends beyond the uropatagium, and a simple, leaf-shaped nose typical of phyllostomid bats.

Size

Body length typically ranges from 5.5 to 6.5 cm, with forearm length around 38-42 mm.

Weight

Adults typically weigh between 10 and 18 grams.

Distinctive features

Distinguished from the closely related Carollia perspicillata by subtle differences in skull morphology, dental characteristics, and slightly smaller body size, though field identification can be challenging.

Differences between males and females

Sexual dimorphism is minimal, with males and females being similar in size and coloration.

Roosts in colonies ranging from a few individuals to several hundred in caves, hollow trees, and culverts, often forming harem-based social structures dominated by a single male.

When it is active

Nocturnal, with peak foraging activity occurring shortly after dusk and again before dawn.

Diet

Primarily frugivorous, feeding heavily on Piper (pepper plant) fruits, as well as other soft fruits; it supplements its diet with nectar, pollen, and occasional insects.

How it feeds and hunts

Forages by flying through the forest understory, using echolocation to locate ripe fruit, and often plucks fruit while hovering briefly before carrying it to a roost to consume.

Communication

Communicates through echolocation calls for navigation and foraging, as well as social vocalizations within roosts; scent may also play a role in mate and roost recognition.

Interactions with other species

Preyed upon by owls, hawks, and opportunistic mammalian predators; competes with other frugivorous bats for fruit resources but also coexists in mixed-species roosts.

Role in its ecosystem

Functions as an important seed disperser for pioneer plant species, particularly Piper species, contributing significantly to forest regeneration and succession dynamics.

Breeding can occur nearly year-round in some populations but often peaks with fruit abundance; females typically give birth to a single pup after a gestation of about 3-4 months.

Raising the young

Females provide all parental care, nursing the single offspring and carrying it during early development until it becomes independent within a few weeks to months.

Maturity and lifespan

Sexual maturity is typically reached within the first year of life; lifespan in the wild is estimated at around 5-10 years, with captive individuals potentially living longer.

Classification

Class Mammalia > Order Chiroptera > Family Phyllostomidae > Genus Carollia > Species Carollia brevicauda

Subspecies

Some taxonomic treatments recognize a few geographically defined populations, but subspecies status within Carollia brevicauda remains debated and is not consistently validated across authorities.

Scientific synonyms

Carollia brevicauda has historically been confused with Carollia perspicillata due to morphological similarity; some older literature lists variant spellings and combinations under the genus Hemiderma.

Recent studies

Recent phylogenetic studies have focused on clarifying species boundaries within the Carollia genus using molecular data, revealing cryptic diversity previously masked by morphological similarity.

Genome and DNA

Karyotype studies indicate a diploid chromosome number typical of the genus Carollia, though detailed genomic sequencing specific to this species remains limited.

Compared with similar species

Closely resembles Carollia perspicillata and Carollia castanea, differing mainly in subtle cranial measurements and slight variations in fur coloration and size.

This bat can consume fruit nearly its own body weight in a single night; it is also one of the most frequently captured bat species in Neotropical mist-net surveys, making it a key study species for bat ecology research.

Where and how to see it

Best observed at dusk near fruiting Piper shrubs in tropical forest edges or secondary growth in Ecuador, Peru, or Colombia; mist-netting surveys by researchers often reveal high capture rates of this species.

Risks to humans

No notable risk to humans; like other bats, it can potentially carry zoonotic pathogens, so direct handling should be avoided.

Human uses

Not directly used by humans, but it is of significant scientific interest as a model species for studies on bat ecology, seed dispersal, and virology.