Overview
The Volcano Rabbit (Romerolagus diazi), affectionately known locally as the Teporingo or Zacatuche, is one of the most distinctive and endangered lagomorphs in the world. Endemic strictly to the volcanic slopes encircling the Valley of Mexico at dizzying altitudes up to 4,200 meters, this diminutive, round-eared creature is the world’s second-smallest rabbit. Lacking the long ears and bouncing stride of typical hares, it navigates complex runways carved through towering clumps of subalpine zacatón grass.
Biology and Physical Characteristics
Romerolagus diazi possesses a stout, rounded body covered in dense, dark yellowish-brown to agouti fur sprinkled with black guard hairs. Its ears are remarkably small and rounded, measuring barely four centimeters in length, an evolutionary adaptation to conserve body heat in freezing high-altitude alpine climates. Its hind legs are relatively short and its tail is virtually invisible, giving it a scurrying, pika-like appearance when moving through dense tussocks. Uniquely among rabbits, it communicates with sharp, high-pitched vocal barks.
Behavior and Ecology
Social and crepuscular, volcano rabbits live in small colonies of two to five individuals, sharing communal underground burrows excavated beneath the thick root networks of zacatón grass (Muhlenbergia and Festuca). They spend the morning and late afternoon grazing along meticulously cleared runways through the tall grass, darting back into burrows when alarmed by red-tailed hawks, bobcats, or rattlesnakes. They rely heavily on the coarse silica-rich grass blades for sustenance and shelter.
Conservation and Human Impact
Classified as Endangered by the IUCN, Romerolagus diazi faces acute threats from the rapid expansion of Mexico City’s urban perimeter, agricultural clearing for potato and oat crops, intentional pasture burning, and illegal timber extraction. Fragmentation of its four isolated volcanic populations hampers genetic diversity. Conservation initiatives, led by national parks such as Izta-Popo Zoquiapan National Park, focus on protecting contiguous zacatón corridors and conducting community-based grassland fire management.
Interesting Factoid
The Volcano Rabbit doesn’t have floppy ears or a fluffy cottontail—instead, it looks like a chubby teddy-bear guinea pig that barks like a pika and lives exclusively on the slopes of snow-capped Mexican volcanoes.
Last updated: October 2026