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Phorusrhacids were large, flightless birds with long hind limbs, narrow pelvises, proportionally small wings and huge skulls, with a tall, long, sideways compressed hooked beak. [9] Kelenken is the largest known phorusrhacid, about 10% larger than the largest phorusrhacids previously known, such as Phorusrhacos.
The beaks of accipitrids are strong and hooked (sometimes very hooked, as in the hook-billed kite or snail kite). In some species, there is a notch or 'tooth' in the upper mandible. In all accipitrids, the base of the upper mandible is covered by a fleshy membrane called the cere, which is usually yellow in colour.
Nightjars are medium-sized nocturnal birds that usually nest on the ground. They have long wings, short legs, and very short bills. Most have small feet, of little use for walking, and long pointed wings. Their soft plumage is cryptically colored to resemble bark or leaves. Lesser nighthawk, Chordeiles acutipennis (A) Common nighthawk ...
The taxonomic treatment [3] (designation and sequence of orders, families and species) and nomenclature (common and scientific names) used in the accompanying bird lists adheres to the conventions of the AOS's (2019) Check-list of North American Birds, the recognized scientific authority on the taxonomy and nomenclature of North America birds.
The Australian white ibis is a fairly large ibis species, around 65–75 cm (26–30 in) long and has a bald black head and neck and a long black downcurved beak, measuring over 16.7 cm (6.6 in) in the male, and under in the female.
A southern royal albatross: Note the large, hooked beak and nasal tubes. The albatrosses are a group of large to very large birds; they are the largest of the Procellariiformes. The bill is large, strong, and sharp-edged, with the upper mandible terminating in a large hook.
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The figbirds and orioles are medium-sized passerines, mostly with bright and showy plumage. The females often have duller plumage than the males. The beak is long, slightly curved and hooked. Orioles are arboreal and tend to feed in the canopy. Eurasian golden oriole, Oriolus oriolus