Ostrich

About

The Ostrich (Struthio camelus) is the largest living bird species, native to Africa. It is flightless, characterized by its long neck and legs, and capable of running at high speeds. Ostriches are well-adapted to arid and semi-arid environments, playing a significant ecological role as large herbivores and seed dispersers.

Size & lifespan

Length

210-280 cm (6.9-9.2 ft)

Wingspan

Approximately 200 cm (6.6 ft) (wings are vestigial and not used for flight)

Weight

63-145 kg (139-320 lbs), with males generally larger than females

Lifespan

30-40 years in the wild, up to 50 years in captivity

Diet

Herbivore (primarily grasses, shrubs, flowers, seeds, fruits), occasionally insects and small vertebrates

Physical characteristics

Plumage

Males have predominantly black body plumage with white primary and tail feathers. Females and juveniles have duller, grayish-brown plumage with off-white primary and tail feathers.

Beak shape

Broad, flattened, and relatively short beak, pale horn-colored.

Eye color

Large, prominent eyes with long black eyelashes, typically dark brown.

Leg color

Long, powerful legs, typically grayish-pink to pale blue, with two toes on each foot (a unique adaptation among birds).

Distinguishing features

Unmistakable due to immense size, long bare neck and legs, and flightless nature. The two-toed foot is a key distinguishing feature.

Juvenile appearance

Covered in spiky, downy plumage, typically mottled brown and tan, resembling adult females but with a more uniform coloration. Legs and neck are shorter in proportion to the body.

Seasonal changes

No significant seasonal plumage changes, though feather condition can vary with molting cycles.

Sexual dimorphism

Pronounced. Males are larger and have striking black and white plumage. Females are smaller and have duller, grayish-brown plumage.

How to identify

1. 1

   Size and Stature

   The sheer size (up to 2.8 meters tall) and long, bare neck and legs are unmistakable. No other bird in its range approaches its dimensions.

2. 2

   Plumage Coloration

   Look for the distinct sexual dimorphism: males are black with white wing and tail feathers, while females are dull grayish-brown with off-white feathers.

3. 3

   Legs and Feet

   Observe the powerful, bare legs and the unique two-toed feet, a key anatomical identifier.

4. 4

   Behavior

   Their characteristic running gait, often in open grasslands, is a strong indicator. Also, look for their habit of foraging in groups.

5. 5

   Vocalizations

   Listen for the deep, booming 'hooo-hooo-hooo' call of the male, especially during the breeding season.

Habitat & range

Biomes

Savannas, grasslands, semi-deserts, and open woodlands.

Geographic range

Native to Africa, primarily found in sub-Saharan Africa. Historically, they ranged into the Middle East, but these populations are now extinct in the wild.

Elevation range

Typically found in lowlands and plains, up to approximately 1,500 meters (4,900 ft) above sea level.

Preferred environments

Open, arid, and semi-arid environments with sparse vegetation, allowing for clear visibility and running space. Avoids dense forests and mountainous terrain.

Behavior

Activity time

Diurnal, most active during the cooler parts of the day, foraging in the morning and late afternoon.

Feeding habits

Primarily grazers and browsers, consuming a wide variety of plant material. They swallow pebbles (gastroliths) to aid in grinding food in their gizzard. They can go for long periods without water, obtaining moisture from their diet.

Social behavior

Typically live in nomadic groups of 5-50 birds, often associating with grazing mammals like zebras and antelopes. During breeding season, dominant males establish territories and form harems of 2-7 females.

Flight pattern

Flightless. Known for their powerful running ability, reaching speeds of up to 70 km/h (43 mph) and sustaining 50 km/h (31 mph) for extended periods.

Migration pattern

Non-migratory, but nomadic, moving in response to rainfall and food availability within their range.

Territoriality

Males are highly territorial during the breeding season, defending their nesting sites and harems aggressively against other males.

Breeding & reproduction

Breeding season

Varies geographically, but generally from March to September in the Northern Hemisphere and July to March in the Southern Hemisphere, often coinciding with rainy seasons.

Nesting habits

Nests are communal scrapes in the ground, typically 30-60 cm (12-24 inches) deep and 3 meters (10 ft) wide, dug by the dominant male. Multiple females lay eggs in the same nest.

Clutch size

A dominant female lays 7-10 eggs, but communal nests can contain 15-60 eggs from several females.

Egg description

The largest eggs of any living bird, weighing 1.4-1.6 kg (3.1-3.5 lbs), about 15 cm (6 inches) long and 13 cm (5 inches) wide. They are creamy white, thick-shelled, and glossy.

Incubation period

35-45 days. The dominant female incubates during the day, and the male incubates at night.

Fledging period

Chicks are precocial and leave the nest within days of hatching, following their parents. They become independent around 9-12 months.

Parental care

Both parents, primarily the dominant male and female, care for the chicks, protecting them from predators and teaching them to forage. Males may also adopt chicks from other broods.

Where to find

Field tips

1. Scan Open Areas. Ostriches are large and often visible from a distance. Use binoculars to scan vast open landscapes.
2. Look for Groups. They are often found in groups, sometimes associating with other large herbivores. Spotting one might lead to finding more.
3. Observe Behavior. Watch for their characteristic foraging (pecking at the ground) or their powerful running if disturbed.
4. Listen for Calls. During the breeding season, listen for the male's booming call, which can help locate them.
5. Early Morning/Late Afternoon. They are most active during the cooler parts of the day, making these times ideal for observation.

Similar species

Quick facts

Largest Bird:

The largest living bird species by mass and height.

Fastest Runner:

The fastest bird on land, capable of speeds up to 70 km/h.

Largest Eyes:

Possesses the largest eyes of any land animal, measuring nearly 5 cm in diameter.

Unique Toes:

The only bird species with just two toes on each foot.

Communal Nests:

Multiple females lay eggs in a single communal nest.

Fun facts

• Ostriches do not bury their heads in the sand. This myth likely originated from their habit of lying down and stretching their necks along the ground to appear inconspicuous, or from their digging nests in the sand.
• Their powerful legs are not only for running but also for defense. A well-aimed kick can be lethal to predators like lions.
• Ostrich eggs are so strong that they can support the weight of a human adult standing on them.
• They have a unique digestive system that allows them to extract water from plants, enabling them to survive in very dry environments without needing to drink water frequently.
• The Ostrich's scientific name, Struthio camelus, translates to 'camel-like sparrow,' referring to its long neck, prominent eyes, and ability to thrive in arid conditions.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Struthioniformes

Family

Struthionidae

Genus

Struthio

Species

Struthio camelus

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