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Mini 2 Flying with BIRDS

Droffarc

Well-Known Member
Joined
Mar 24, 2021
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Location
Western Cape South Africa
Seabirds of southern Africa employ variety of breeding strategies. Some lay their eggs in spring, others in
autumn and still others virtually throughout most of the year. Eggs produced in spring will normally have
hatched by summer, when day length is longest. Because most seabirds hunt in daylight, there is more time in
summer for parents to obtain food for their chicks. The Hartlaub's gull is more nocturnal than the other
species. For example, after dark it has been known to catch insects attracted to streetlights near Cape Town's
docks.
Many of the fish preyed on by seabirds are only seasonally available in certain areas, and this fact too is an
important consideration in selecting a time to breed. Bank cormorants often nest in the most precarious
places, and their entire nest can be washed away by heavy seas. For species subject to such hazards, it is
obviously important to be able to lay another clutch of eggs should the necessity arise, and the breeding
season is then often prolonged. Of course, with an extended breeding season it is possible for parents to raise
more than one brood of chicks in a year.
Clutch size also varies. Cape gannets and swift terns generally lay a single egg, African penguins normally two,
and cormorants and kelp gulls often three eggs or even as many as five. Obviously, the larger the clutch, the
greater the number of mouths to feed, but the faster the potential of the population to increase. With a single
chick, it is easier for the parents to ensure that it is adequately fed. Rarely do gannet chicks starve, but Cape
cormorants have frequently deserted their nests if food is scarce nearby. When the nests have eggs or small
chicks, one parent has to remain at the nest to incubate the egg, to shelter the young chicks from intense heat
or cold, or to guard both from attack by kelp gulls, which frequently make a meal of an unprotected egg or
chick. Therefore, if one parent is absent too long, the attendant parent is forced to leave to feed itself.

Taken with Mini2 on 22 April 2021

 
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