Leporidae — the family of rabbits and hares

Characteristics

Leporids share a set of physical and physiological features that distinguish them from other mammals. Typical traits include long ears that aid in hearing and thermoregulation, elongated and powerful hind legs adapted for leaping, and a compact, lightweight body. Dentally they differ from rodents: lagomorphs possess a second small pair of upper incisors (so-called "peg teeth") behind the primary pair. Most are herbivores, feeding on grasses, herbs and plant material, and their digestive systems are adapted to extract nutrients from fibrous vegetation.

Evolution and distribution

Fossils and comparative anatomy place leporids within the broader evolutionary story of lagomorphs, which diverged from other mammal groups in the Paleogene. Modern leporids appear in the fossil record several million years later and diversified into many forms adapted to open plains, woodlands and rocky terrain. Today they are native to every continent except Antarctica and have been introduced to other regions by humans; some introductions have led to ecological impacts where populations established outside their native ranges.

Ecology, behavior and life cycle

Leporids often occupy key roles as prey species for predators and as herbivores that influence plant communities. Reproductive strategies are notable for high fecundity: many species breed repeatedly during favorable seasons and produce litters with rapid growth. Behavioral ecology varies by group — for example, species commonly called rabbits may dig burrows or warrens, whereas many hares are adapted to open-country life and give birth to more developed, precocial young that are mobile shortly after birth.

Human interactions and importance

Humans have long interacted with leporids. Some species, such as the European rabbit (the ancestor of domestic rabbits), have been domesticated and kept as pets, for meat and for fur. Others are hunted as game, and a few have become agricultural pests where population control is necessary. Diseases such as myxomatosis and hemorrhagic viral diseases have had major effects on populations and management practices. Conservation status varies: while many species are common, habitat loss, hunting and disease threaten certain local populations.

Distinctions and notable facts

• "Rabbit" and "hare" are common names, not strict taxonomic divisions; different genera are often called one or the other based on behavior and morphology.
• Leporidae should not be confused with the closely related family Ochotonidae, which contains the pikas and has distinct ecological and anatomical traits.
• The family's adaptability and reproductive capacity make leporids both resilient and, in some contexts, capable of becoming invasive.