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02 January, 2019

BADLI Pamela Sixako ne Chhuta Karva Babat : 1/1/2019 no official Latest Paripatra.

BADLI Pamela Sixako ne Chhuta Karva Babat :  1/1/2019 no official Latest Paripatra.

Difficulties in distinguishing Australian corvids has hampered understanding of seasonal movements. The Australian raven is thought to be largely sedentary, with most movement of over 16 km (9.9 mi) due to flocks of non-breeding subadult birds.[37] Juvenile birds leave their parents and join flocks when they are four or five months old. Smaller flocks of 8–30 birds stay within an area of around 260 square kilometres, while larger flocks of up to 300 birds may travel hundreds of kilometres seeking food.[38]

A single breeding pair and their brood can occupy a territory of up to around 120 hectares (300 acres) and remains there year-round, though groups of ravens may enter this area to forage.[37] Australian ravens will defend their territory by chasing, dive-bombing and occasionally striking the backs of birds of prey, foxes or even people.[39] They generally mate for life, though occasionally one male has been found to be mated with two females in adjacent territories.[31] If the female dies, the male Australian raven maintains the territory and finds another mate, while if the male bird is lost, the female abandons the territory.[40] No courtship behaviour has been observed, and species that mate for life often lack elaborate courting displays.[31] Once they begin breeding at three years of age, they live another four to five years on average. During this time they produce two surviving young each year on average.[40] The longest-lived Australian raven recorded is an adult (of at least 3 years of age) that was banded and recaptured alive 12 years and 5 months later.[38]

Australian ravens generally walk when moving around on the ground, though do hop when hurrying. They preen themselves frequently, particularly when roosting in the middle of the day. They also engage in allopreening, where birds will preen each other's head and neck. This takes place particularly in autumn, winter and spring, and is important in pair bonding.[31] Either member may initiate it, generally by landing near the other bird, shuffling next to its mate, then bending its head forward and presenting its nape.[

BADLI Pamela Sixako ne Chhuta Karva Babat :  1/1/2019 no official Latest Paripatra.


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