Most medium to large-sized birds of prey tend to have long bonds with their mate and will use the same hunting and nesting territory year after year. These birds may have different nests in their territory and will rotate their use from year to year.
Birds build there nests everywhere from directly on the ground to the tops of trees. The Belted Kingfisher builds its nest in the bank of a river or a creek, digging it 4 ft. deep into the bank. Grebes build a floating nest on water. Understanding that birds place their nests everywhere is an important concept for protecting birds during the nesting season.
The bee hummingbird which is 2.5 inches long (6.2 cm) weighing only 0.06 oz (1.6 g.)
With a mass of approximately 1.8 grams (0.063 oz) and a length of 5 centimetres (2.0 in), it is the smallest living bird as well as (when paleontologist are concerned) the smallest theropod dinosaur on record.
The Peregrine Falcon, which can reach speeds over 320 km/h (200 mph) in a stoop, making it the fastest animal on the planet.
The Peregrine Falcon has a body length of 34 to 58 centimetres (13–23 in) and a wingspan of around 80 to 120 centimetres (31–47 in).
The Australian Pelican's beak is up to 18.5 inches (47 cm) long.
The Australian Pelican can be found widespread on the inland and coastal waters of Australia and New Guinea, also in Fiji, parts of Indonesia and as a vagrant toNew Zealand.
The Great Bustard weighing as much as a six (6)-year old human child.
An adult male typically is 90–110 cm (3.0–3.6 ft) long with a 2.1–2.5 m (6.9–8.2 ft) wingspan and usually weighs from 10 to 16 kg (22 to 35 lb).