o The
flightless ostrich is the world’s largest bird.
o Ostriches
have three stomachs.
o Unlike all
other living birds, the ostrich secretes urine separately from faeces.
o Ostriches
are the fast runners of any birds or other two-legged animal and can sprint at
over 70 km/hr, covering up to 5m in a single stride.
· Ostriches’
running is aided by having just two toes on each foot (most birds have four),
with the large nail on the larger, inner toe resembling a hoof.
· Ostriches’
wings reach a span of about 2 metres and are used in mating displays, to
shade chicks, to cover the naked skin of the upper legs and flanks to conserve
heat, and as “rudders” to help them change direction while running.
· When
threatened ostriches run although their powerful, long legs can be formidable
weapons, capable of killing a human or a potential predator like a lion with a
forward kick.
· Ostriches
normally spend the winter months in pairs or alone and during breeding
season and sometimes during extreme rainless periods they live in nomadic
‘herds’ of five to 50 birds led by a top hen, that often travel together with
other grazing animals, such as zebras or antelopes.
· Territorial
fights between males for a harem of two to seven females usually last just
minutes, but they can easily cause death through slamming their heads into
opponents.
· Ostriches
perform a complex mating ritual consisting of the cock alternating wing beats
until he attracts a mate, when they will go to the mating area and he will
drive away all intruders. They graze until their behaviour is synchronized,
then the feeding becomes secondary and the process takes on a ritualistic
appearance. The cock will then excitedly flap alternate wings again, and start
poking on the ground with his bill. He will then violently flap his wings to
symbolically clear out a nest in the dirt. Then, while the hen runs circle
around him with lowered wings, he will wind his head in a spiral motion. She
will drop to the ground and he will mount for copulation.
· All of the
herd’s hens place their eggs in the dominant hen’s 3m-wide nest, though her own
are given the prominent centre place; each female can determine her own eggs
amongst others.
· The giant
eggs are the largest of any living bird at 15cm long and weighing as much as
two dozen chicken eggs, though they are actually the smallest eggs relative to
the size of the adult bird.
· The eggs
are incubated by the dominant female by day and by the male by night, using the
colouration of the two sexes to escape detection of the nest, as the drab
female blends in with the sand, while the black male is nearly undetectable in
the dark.
· When the
eggs hatch after 35 to 45 days incubation, the male usually defends the
hatchlings and teaches them to feed, although males and females cooperate in
rearing chicks.
· Contrary
to popular belief, ostriches do not bury their heads in the sand: the myth
probably originates from the bird’s defensive behaviour of lying low at the
approach of trouble and pressing their long necks to the ground in an attempt
to become less visible. Their plumage blends well with sandy soil and, from a
distance, gives the appearance that they have buried their heads in the sand.
· The Ostrich
is farmed around the world, particularly for its decorative feathers and also
for its meat which is marketed commercially and its skin is used for leather
products.
· Ostriches
have inspired cultures and civilizations for 5,000 years in Mesopotamia
and Egypt.
· In some
African countries, people race each other on the back of ostriches with special
saddles, reins, and bits.
· The wild
ostrich population has declined drastically in the last 200 years, with most
surviving birds in game parks or on farms.
· Unlike most
birds the males have a copulatory organ, which is retractable and 20 cm long.
· Lacking
teeth, ostriches swallow pebbles to grind their food. An adult ostrich carries
about 1kg of stones at any one time.
· Ostriches
can go without drinking for several days, using metabolic water and moisture in
ingested roots, seeds and insects, but they enjoy liquid water and frequently
take baths where it is available.
· The
ostrich has the largest eye of any land animal, measuring almost 5 cm across,
allowing predators such as lions to be seen at long distances.