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The vast majority of bird species are socially (but not necessarily sexually) monogamous, usually for one breeding season at a time, sometimes for years, and rarely for life. Other species have breeding systems that are polygynous (one male with many females) or, rarely, polyandrous (one female with many males).
The Life of Birds is a BBC nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 21 October 1998. A study of the evolution and habits of birds, it was the third of Attenborough's specialised surveys following his major trilogy that began with Life on Earth. Each of the ten 50-minute ...
The evolution of birds began in the Jurassic Period, with the earliest birds derived from a clade of theropod dinosaurs named Paraves. [1] Birds are categorized as a biological class, Aves. For more than a century, the small theropod dinosaur Archaeopteryx lithographica from the Late Jurassic period was considered to have been the earliest bird.
The vegetative stage encompasses those phases of the life cycle involved with the germination, spread, and survival of the mycelium. Spores germinate under suitable conditions of moisture and temperature, and grow into branching filaments called hyphae , pushing out like roots into the rotting wood.
A common blackbird has an average life expectancy of 2.4 years, [35] and, based on data from bird ringing, the oldest recorded age is 21 years and 10 months. [ 36 ] Female with nesting material
No other bird spends as much of its life in flight. Contrary to common belief, swifts can take flight from level ground. [11] Their maximum horizontal flying speed is 111.6 km/h (69.3 mph) [12] Over a lifetime they can cover millions of kilometers. [13] Feeding parties can be very large in insect-rich areas, such as wetlands.
The brown-headed cowbird (Molothrus ater) is a small, obligate brood parasitic icterid native to temperate and subtropical North America. It is a permanent resident in the southern parts of its range; northern birds migrate to the southern United States and Mexico in winter, returning to their summer habitat around March or April.
Feather development occurs in the epidermal layer of the skin in birds.It is a complicated process involving many steps. Once the feathers are fully developed, there are six different types of feathers: contour, flight, down, filoplumes, semiplumes, and bristle feathers.