I’ve stressed that before when city people say they’ll never see an owl, owls are everywhere people are, because that’s where the rodents are, and where there’s tasty rodents they’ll be hungry owls to welcome them!

Some owls are deeeeeep woods creatures, but many have evolved to live better nearby to people. As I said, the rodents gather around all our food, and our clearing trees and maintaining fields and orchards give them nice places to sit up high, yet monitor a nice clear open area to fly. Little Owls are big fans of us humans, and I know I’ve posted some Australian studies about how Powerful Owls are adapting as cities and towns expand into their hunting areas.

Nesting depends on many conditions, since GHO are found over a wide range of ecosystems. From Wikipedia:

The stage at which eggs are laid is variable across North America. In Southern Florida, eggs may be laid as early as late November to as late as early January. In the southeast, from south Texas to Georgia, egg laying may begin from late December to early February. From Southern California to northern Louisiana, egg laying is from early February to late March. The largest swath of egg-laying owls from central California to South Carolina to as far north as Ohio and Massachusetts is from late February to early April. In the Rocky Mountains, Northwestern United States, northern New England and eastern Canada, egg laying is from early March to late April. In the rest of Canada and Alaska, egg laying may be from late March to early May. The latest known date of egg laying was in mid-June in Saskatchewan and the Yukon Territory. In northwestern Utah and north-central Alberta, egg-laying can be 3–4 weeks earlier than usual when food is abundant and weather is favorable.

While urban and rural populations show little difference in productivity, there are differences in nest selection. Rural owls use old raptor nests more frequently than urban birds, who utilize crow or squirrel nests. Additionally, urban nesting individuals utilize trees that are taller/wider in diameter and nest much higher compared to rural nesting Great Horned Owls. The reason behind this increased tree height is due to the fact that urban areas have large trees used for ornamentation, shade and shelter. The higher nesting within the taller trees was attributed to human avoidance. Both rural and urban nesting sites were often within range of paved roads, likely a result of the great horned owl’s tendency to hunt along roadways.

Studies have shown that nesting in urban areas can influence adult great horned owls to lay eggs earlier than those who nest in rural areas. In Wisconsin, eggs in urban nests hatched a month earlier (January rather than February) than their counterparts in rural areas, probably due to increased protection from wind and cold. Nesting owls at sites in Winnipeg, Manitoba began nesting five to six weeks earlier than those in rural parts of Manitoba, presumably due to experiencing an extremely warm winter by Winnipeg’s standards, as well as benefitting from the local urban heat island.