The Tiger of the Sky

The Great Horned Owl (Bubo virginianus) is often called the "tiger of the sky" — a title that reflects both its physical power and its willingness to take on surprisingly large and dangerous prey. It is the heaviest owl in North America and one of the most adaptable raptors on the continent, found in habitats ranging from Arctic treelines to tropical rainforest fringes, and from remote wilderness to city parks.

Appearance

The Great Horned Owl is an immediately imposing bird:

  • Size: 46–63 cm in length; wingspan up to 153 cm; weight typically 900g–2.5 kg
  • Plumage: Mottled brown, buff, and black above; barred below; with a distinctive white throat patch
  • Ear tufts: Large, widely spaced "horns" (not actually ears — these are feather tufts used in display and camouflage)
  • Eyes: Large, vivid yellow eyes — among the largest eyes relative to skull size of any bird
  • Facial disc: Rust-brown to grey facial disc outlined in black

Plumage varies considerably across its vast range — northern birds tend to be paler, while birds in humid Pacific coastal forests are noticeably darker.

Range and Habitat

Few birds match the Great Horned Owl for habitat versatility. Its range spans virtually the entire American continents, from the northern boreal forests of Alaska and Canada south through Central America to Tierra del Fuego at the southern tip of South America. Within this range it occupies:

  • Deciduous, coniferous, and mixed forests
  • Desert canyons and scrublands
  • Grasslands and agricultural land
  • Swamps and river corridors
  • Suburban parks, golf courses, and urban green spaces

This remarkable breadth of habitat tolerance is central to the species' success.

Hunting: Power and Diversity

The Great Horned Owl is famous for the extraordinary range of prey it will take. A non-exhaustive list includes:

  • Rabbits and hares (a dietary staple)
  • Rats, mice, voles, and squirrels
  • Skunks (Great Horned Owls are one of the few predators that regularly prey on skunks, being largely insensitive to musk)
  • Geese, ducks, and herons — prey sometimes larger than the owl itself
  • Other raptors, including Ospreys and Peregrine Falcons
  • Cats and small dogs in suburban areas
  • Snakes, toads, and large insects

Its talons exert a gripping force comparable to that of a large eagle — the compressive power is sufficient to crush the spine of prey immediately upon contact. This makes it capable of killing animals considerably heavier than itself.

Nesting: The Earliest Breeder

The Great Horned Owl holds a notable record among North American birds: it is one of the earliest breeders, often beginning courtship displays in mid-winter and laying eggs while snow still covers the ground. This is an adaptation to align chick-rearing with the peak availability of prey in spring and early summer.

Great Horned Owls do not build their own nests. Instead, they appropriate existing structures — most commonly the abandoned stick nests of hawks, crows, or herons. They may also use large tree cavities, cliff ledges, or human-made structures.

  • Clutch size: Usually 1–3 eggs
  • Incubation: Approximately 30–37 days, primarily by the female
  • Fledging: Young owls leave the nest at around 6–7 weeks but remain dependent on parents for several months

Calls and Communication

The deep, resonant hooting of the Great Horned Owl — typically rendered as hoo-h'HOO-hoo-hoo — is one of the most evocative sounds of the North American wilderness. Males and females often duet, with the female's voice slightly higher in pitch than the male's. Both sexes also produce a range of barks, screams, and bill-clacks when threatened or disturbed.

Status and Interaction with Humans

The Great Horned Owl is not currently of conservation concern — its populations are considered stable across most of its range, making it one of the few large predatory birds not facing significant decline. It is protected under the Migratory Bird Treaty Act in the United States and equivalent legislation in Canada and Mexico. Incidental conflicts with humans, particularly in suburban areas where the owls may occasionally prey on small pets, are the most common points of friction — generally manageable through awareness and common-sense precautions.