Overview
The Short-eared Dog (Atelocynus microtis), also known as the short-eared zorro, is one of the most enigmatic, reclusive, and rarely glimpsed carnivores in the entire Amazon rainforest basin. As the sole living member of the genus Atelocynus, this solitary canid has evolved unique semi-aquatic habits and morphological features distinct from all other South American canids, making it a critical sentinel of intact tropical rainforest ecosystems.
Biology and Physical Characteristics
Atelocynus microtis possesses a sleek, low-slung build adapted for gliding silently through dense jungle undergrowth. Its coat consists of short, coarse fur varying from dark mahogany and agouti-grey to nearly jet black, with a darker dorsal stripe running to a bushy tail. Its common name stems from its unusually short, rounded ears, which measure just 1.5 to 2 inches (3.5–5 cm) in length to prevent snagging in thick vegetation. Notably, the species displays partial interdigital webbing on its paws, providing traction on muddy riverbanks and aiding in swimming.
Behavior and Ecology
Extremely shy of human presence, the short-eared dog leads an elusive, largely solitary lifestyle. It is active both diurnally and nocturnally, relying on its keen sense of smell to forage along river margins, marshy pools, and flooded hollows. Unlike most other wild canids that hunt primarily cursorial terrestrial prey, Atelocynus microtis specializes in aquatic and semi-aquatic prey, skillfully scooping small fish, crabs, and amphibians from shallow streams alongside rodents and insects.
Conservation and Human Impact
The International Union for Conservation of Nature (IUCN) assesses the Short-eared Dog as Near Threatened, with wild populations experiencing ongoing fragmentation. Primary threats include deforestation driven by cattle ranching, infrastructure expansion, and diseases transmitted by domestic hunting dogs such as rabies and canine distemper. Because it requires large expanses of undisturbed continuous canopy cover, its presence serves as an ecological barometer for forest health.
Interesting Factoid
The Short-eared Dog has partially webbed toes that allow it to paddle efficiently through Amazonian rivers and hunt live fish in shallow flooded forests.
Last updated: October 2026