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[100] Birds are solely gonochoric, [101] meaning they have two sexes: either female or male. The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). [78]
The chickadee (specifically the black-capped chickadee Poecile atricapillus, formerly Parus atricapillus) is the official bird for the US state of Massachusetts, [5] the Canadian province of New Brunswick, [6] and the city of Calgary, Alberta. [7] The chickadee is also the state bird of Maine, but a species has never been specified. A proposed ...
Most birds of prey have eyes on the sides of their heads, but the stereoscopic nature of the owl's forward-facing eyes permits the greater sense of depth perception necessary for low-light hunting. Owls have binocular vision , but they must rotate their entire heads to change the focus of their view because, like most birds, their eyes are ...
Interesting Facts for Adults. 11. If you cut down a cactus in Arizona, it can result in a class 4 felony and up to 25 years in prison. 12. Wearing headphones for just an hour can increase the ...
On the voyage, 100 of his 140 rowers died of hunger on their way, but the survivors reached Aotona and captured enough parrots to fill 140 bags with their feathers. [146] [147] Parrots have also been considered sacred. The Moche people of ancient Peru worshipped birds and often depicted parrots in their art. [148]
The common blackbird (Turdus merula) is a species of true thrush.It is also called the Eurasian blackbird (especially in North America, to distinguish it from the unrelated New World blackbirds), [2] or simply the blackbird where this does not lead to confusion with a similar-looking local species.
The great black hawk is a resident breeding bird in the tropical New World, from Mexico through Central America to Peru, Tobago and northern Argentina. It is a mainly coastal bird, but also lives in forests and open woodland near water.
Bustards are large terrestrial birds mainly associated with dry open country and steppes in the Old World. They are omnivorous and nest on the ground. They walk steadily on strong legs and big toes, pecking for food as they go. They have long broad wings with "fingered" wingtips and striking patterns in flight. Many have interesting mating ...