Knife-billed hummingbird, also known as sword-beaked hummingbird, is a genus of knife-billed hummingbirds in the hummingbird family Hummingbird family. With a body length of 14 cm and a weight of about 12 grams, it is one of the largest species of hummingbirds. The tubular beak is slender as a sword, averaging 8 cm long and reaching a maximum length of 10.5 cm. The extremely long beak is its most prominent feature, and in terms of body proportions, their beak is also the longest of all birds. The special beak is adapted to the honey source plants with a very long local corolla. Native to the Andes Mountains of South America, it inhabits dense forests at altitudes above 2500 meters.
The body is covered with scaly feathers, bright colors, with a special reflective effect, and the male is more colorful. Whenever they fly in the sun, they can reflect a variety of different colors. The head is tan, the upper part of the wings is yellow-green, the lower part is tan, the rest of the body feathers are copper-green, and the whole body is shining with metallic luster. The tongue is longer than the beak of a bird and is free to stretch and contract. The wings are narrow and long, with a forked tip of the tail. The feet are short and the toes are small and weak. When flying, the wings flap rapidly, fast, powerful and long-lasting, with a frequency of more than 50 times per second.
Lick the nectar through the slender tongue. It feeds mainly on the nectar of small, brightly colored and fragrant flowers. Because hover flight is physically demanding, they must eat tens of thousands of times a day, and they can smoke more than half of their weight in a day. Although the knife-billed hummingbird is petite, it is very brave in temperament. When encountering birds that are much larger than themselves, they also dare to fight with them, and they will constantly speed around each other's bodies, making humming sounds, often making the other party dizzy and deaf, losing and fleeing.
Hummingbird, is a collective name for hummingbirds in the family Hummingbird family, with a total of 355 species in 1 family, 2 subfamilies, 104 genera. It is named after the buzzing sound of the wings when flying, which resembles a bee. It is widely distributed on the American continent. It is small in size, with bright plumage and shines with an iridescent or metallic luster. The plumage is generally blue or green. The mouth is slender and straight, some are curved downwards, and some species are curved upwards. Good at lingering in the flowers for a long time, "grounding", and sometimes flying backwards. Characterized by sexual type II, the female is larger than the male, and the male usually has more feathers and feathers.