Eagles are some of the largest birds of prey. The White-tailed Eagle Haliaeetus albicilla has the largest wingspan at up to 8 feet long, whereas the Steller’s Sea Eagle Haliaeetus pelagicus (Vulnerable) is the heaviest and can weigh up to around 7 kg. Female eagles are typically larger than males of the same species.They vigorously defend their nesting territory when breeding, yet become gregarious when not breeding. They will sit (perch) for long hours; in winter, for up to 98 percent of the day, conserving energy. They will select winter night roosts that meet very specific criteria (slope, aspect, etc.)
