Birds comparison

Ostrich vs Emu: Key Differences Explained

The short answer

Count the toes. An ostrich is the only living bird with just two toes on each foot, while an emu has three. Size follows the same order: adult ostriches commonly stand somewhere around 2.1 to 2.8 metres, emus roughly 1.5 to 1.9 metres, with sex and condition shifting both. An ostrich has a bare neck and thighs, and breeding males are black with white wing and tail plumes. An emu is uniformly shaggy grey-brown. Ostriches are African, emus only Australian.

The main difference

An ostrich has two toes, bare neck and thigh skin and is the tallest living bird; an emu has three toes and shaggy hair-like brown plumage.

They are the two flightless birds most people can name, they are farmed side by side outside their native ranges, and a single foot character separates them absolutely even when size and posture look similar in a photograph.

At a glance

Comparison of Ostrich and Emu across 7 dimensions, with an interpretation of each difference.
What differs	Ostrich	Emu	What it means
Toes per foot	Two, a large weight-bearing inner toe and a smaller outer one	Three, all forward-facing	No other living bird has two toes, so a clear view of the foot is conclusive.
Height and mass	Commonly around 2.1 to 2.8 metres tall and roughly 100 to 150 kg in adults	Commonly around 1.5 to 1.9 metres tall and roughly 30 to 55 kg in adults	An ostrich looks over the roof of a car; an emu looks a tall person in the eye.Figures vary with sex, subspecies, population and captive conditions, and males and females differ in both species.
Feather texture and colour	Loose plumes; breeding males black with white wing and tail plumes, females and immatures grey-brown	Double-shafted shaggy grey-brown feathers that hang like coarse hair over the whole body	Emu feathers grow two vanes from one shaft, which is why the bird looks furred rather than feathered.
Neck and head	Long bare neck of pink, grey or bluish skin depending on population, with a small flat head and very large eyes	Neck sparsely feathered with bluish skin showing through, head small and dull-coloured	Bare skin the colour of the population is an ostrich trait; an emu neck looks scruffy rather than naked.
Native range	Africa, in savanna, semi-desert and open scrub, with a separate species in the Horn of Africa	Mainland Australia, across woodland, scrub, grassland and the semi-arid interior	Outside farms and parks the ranges never meet, so location alone usually answers the question.
Who incubates	A communal nest scraped by the male, with a dominant hen and the male sharing incubation between them	The male incubates alone for around eight weeks, eating and drinking very little, then rears the chicks	Both are male-heavy systems, but only the emu leaves the job entirely to one bird.
Loudest sound	Deep booming produced by males, sometimes mistaken at distance for a large mammal	A low resonant drumming and booming produced mainly by females using an inflatable neck pouch	The sexes producing the signature sound are reversed between the two species.

Toes per foot: OstrichTwo, a large weight-bearing inner toe and a smaller outer one
EmuThree, all forward-facing
No other living bird has two toes, so a clear view of the foot is conclusive.
Height and mass: OstrichCommonly around 2.1 to 2.8 metres tall and roughly 100 to 150 kg in adults
EmuCommonly around 1.5 to 1.9 metres tall and roughly 30 to 55 kg in adults
An ostrich looks over the roof of a car; an emu looks a tall person in the eye.Figures vary with sex, subspecies, population and captive conditions, and males and females differ in both species.
Feather texture and colour: OstrichLoose plumes; breeding males black with white wing and tail plumes, females and immatures grey-brown
EmuDouble-shafted shaggy grey-brown feathers that hang like coarse hair over the whole body
Emu feathers grow two vanes from one shaft, which is why the bird looks furred rather than feathered.
Neck and head: OstrichLong bare neck of pink, grey or bluish skin depending on population, with a small flat head and very large eyes
EmuNeck sparsely feathered with bluish skin showing through, head small and dull-coloured
Bare skin the colour of the population is an ostrich trait; an emu neck looks scruffy rather than naked.
Native range: OstrichAfrica, in savanna, semi-desert and open scrub, with a separate species in the Horn of Africa
EmuMainland Australia, across woodland, scrub, grassland and the semi-arid interior
Outside farms and parks the ranges never meet, so location alone usually answers the question.
Who incubates: OstrichA communal nest scraped by the male, with a dominant hen and the male sharing incubation between them
EmuThe male incubates alone for around eight weeks, eating and drinking very little, then rears the chicks
Both are male-heavy systems, but only the emu leaves the job entirely to one bird.
Loudest sound: OstrichDeep booming produced by males, sometimes mistaken at distance for a large mammal
EmuA low resonant drumming and booming produced mainly by females using an inflatable neck pouch
The sexes producing the signature sound are reversed between the two species.

How they are related

Both are palaeognaths, the ancient branch of birds usually called ratites, but they sit in different orders: ostriches in Struthioniformes and emus in Casuariiformes, where their closest living relatives are the cassowaries. Molecular work generally recovers ostriches as the earliest-diverging living palaeognath lineage, and places the flying tinamous within the group, which implies flight was lost more than once rather than in a single ancestor.

Telling them apart

Look at the feet first, then the skin. Two toes means ostrich, three means emu, and no other living bird shares the ostrich condition. An ostrich also shows a long bare neck and bare thighs, with breeding males in striking black and white. An emu has no bare thighs, its neck is only sparsely feathered, and its plumage hangs in coarse grey-brown strands that read as hair from a distance.

Two toes, bare neck, enormous, black-and-white male, African: ostrich. Three toes, shaggy brown coat of hair-like feathers, mid-sized, Australian: emu. If you are looking at a farm bird outside either continent and cannot see the feet, use plumage texture, because the emu's double-shafted feathers never look like the ostrich's loose plumes. Neck skin helps too: an ostrich neck is genuinely naked, while an emu's is merely thinly covered.

Habitat and distribution

Ostriches occupy African savanna, open scrub, semi-desert and short grassland where long sightlines suit a bird that relies on vision. Emus range across most of mainland Australia except dense rainforest and heavily built-up areas, moving nomadically over long distances in response to rainfall and the food it produces. Both tolerate arid conditions, but the emu's habit of tracking rain across a continent has no close ostrich equivalent.

Diet and ecological role

Both are broad herbivores that also take invertebrates and small animals opportunistically. Ostriches eat seeds, shoots, leaves, flowers and succulents, plus insects and occasional small vertebrates, and swallow grit and stones that help grind food in the gizzard. Emus take fruits, seeds, flowers, young shoots and large numbers of insects, and their long movements make them significant seed dispersers across Australian landscapes.

Behaviour

Ostriches live in loose groups that shift in size with season, rely heavily on eyesight to detect disturbance across open ground, and use their wings for balance and steering when running as well as for display. Emus are more often seen singly, in pairs or in loose aggregations at food and water. In both species the male takes the leading parental role, and emu males famously go without much food or drink through incubation.

Senses and adaptations

Ostriches have exceptionally large eyes for a land vertebrate and a visual system suited to spotting movement far across open country, and the reduced two-toed foot is widely interpreted as a running specialisation, with sustained speeds among the highest recorded for any bird. Emus conserve water and heat with a nasal system that recovers moisture from exhaled air, and their double feathers insulate against both heat and cold.

More on this topic: Animal senses and adaptations.

Lifespan and life stages

Ostriches are commonly reported to live into their thirties or forties, with farmed birds monitored over long productive lives, while emus are usually cited at around ten to twenty years in the wild and longer in captivity. Both estimates rest on managed populations far more than on marked wild birds, and predation on eggs and chicks means most individuals in either species never reach adulthood.

People and these animals

Both are farmed well outside their native ranges for meat, leather, feathers and oil, and ostrich plumes drove an intense international trade in the early twentieth century that collapsed with fashion. The emu is a national symbol in Australia, appearing on the coat of arms, and has a long history of conflict with cereal farming, including a widely reported government culling operation in 1932 that failed conspicuously.

Keeping them: what to understand first

These are large livestock or exhibit birds, not pets. Keeping either normally requires secure land, specialist fencing, veterinary access and, in many jurisdictions, licences and welfare compliance, and both can be dangerous to handle inexpertly. Nothing here is a recommendation to acquire an ostrich or emu; anyone considering it should consult the relevant agricultural authority and a veterinarian experienced with ratites.

What they have in common

Both are large flightless palaeognaths with strong legs and reduced wings.
Both are broad herbivores that also take invertebrates and swallow grit.
In both, the male takes the leading role in incubation and chick rearing.
Both are farmed internationally for meat, leather and other products.

Key differences

Ostriches have two toes; emus have three.
Ostriches are substantially taller and heavier than emus.
An ostrich has a bare neck and thighs; an emu is shaggily feathered with a sparsely feathered neck.
Breeding male ostriches are black and white; emus of both sexes are grey-brown.
Ostriches are African, emus exclusively Australian in the wild.
Male ostriches boom, while in emus the deep drumming comes mainly from females.

Where people go wrong

Calling any large flightless bird an ostrich regardless of continent or toe count.
Believing ostriches bury their heads in sand.
Assuming ratites form a single tidy group that lost flight once, when tinamous complicate the picture.
Reading a female or immature ostrich as an emu because it is grey-brown rather than black and white.

Frequently asked questions

How many toes does an ostrich have compared with an emu?

An ostrich has two toes on each foot, a large inner one that carries most of the weight and a smaller outer one, and it is the only living bird built that way. An emu has three forward-facing toes, as do cassowaries and rheas. Because no other bird shares the ostrich condition, a clear view of a footprint or foot is enough to settle the identification on its own.

Which is taller, an ostrich or an emu?

The ostrich, by a clear margin. Adults commonly stand around 2.1 to 2.8 metres and weigh roughly 100 to 150 kilograms, making it the tallest and heaviest living bird. Emus usually reach about 1.5 to 1.9 metres and 30 to 55 kilograms, second among living birds by height. All these figures shift with sex, population and captive conditions and should be read as typical ranges.

Are ostriches and emus close relatives?

They are related as palaeognaths, the ancient lineage often called ratites, but they sit in different orders and are not each other's nearest kin. The emu's closest living relatives are the cassowaries. Molecular studies generally place ostriches as the earliest branch among living palaeognaths and put the flying tinamous inside the group, implying that flightlessness arose more than once.

Which parent incubates the eggs in each species?

Male emus do it alone, sitting for roughly eight weeks and eating and drinking very little through the period, then leading the striped chicks for months afterwards. Ostriches share the work: the male scrapes a communal nest that several hens lay into, and he and the dominant hen take turns, with the male generally covering the night shift and the hen the day.

Do ostriches really bury their heads in the sand?

No. The image appears to come from the bird lowering its head to the ground, either to turn eggs in a shallow nest scrape or to lie flat with the neck stretched out on the ground, which at distance can look as if the head has vanished. An ostrich relies on excellent long-distance vision, so hiding its own eyes would be the opposite of useful.

Read the full profiles

Sources and methodology

How this comparison is built: FaunaHub comparisons are assembled from the sourced animal profiles behind them rather than written as standalone claims. Figures such as size, mass, and lifespan are typical ranges that vary by subspecies, population, region, sex, age, and — where relevant — whether an animal lives in the wild or under human care, so they are presented as ranges rather than fixed values. Where a common name covers a group rather than a single species, the page says so instead of implying a species-to-species match. Conservation status changes over time and should be confirmed against the current IUCN Red List. Dimensions that could not be supported from the underlying profiles are omitted rather than filled in.

What this page does not do: it does not rank the two animals, predict the outcome of a confrontation, or present either one as stronger, smarter, or better. It is not veterinary, medical, first-aid, handling, capture, hunting, or pest-control guidance. For an animal in your care, or any situation involving injury, contact a qualified veterinarian, your local wildlife authority, or emergency services.

Sources and further reading

Authoritative references used for general educational context. External links open in a new tab. These sources do not endorse FaunaHub.

UniversityAnimal Diversity Web — Struthio camelus (ostrich) — University of Michigan species account
ReferenceBritannica — Ostrich — Editor-reviewed encyclopedia entry
Wildlife referenceIUCN Red List of Threatened Species — Authoritative source for current conservation status
UniversityAnimal Diversity Web — Dromaius novaehollandiae (emu) — University of Michigan species account
ReferenceBritannica — Emu — Editor-reviewed encyclopedia entry
UniversityAnimal Diversity Web — University of Michigan Museum of Zoology — Peer-edited reference accounts for animal species
ReferenceEncyclopaedia Britannica — Animals reference — Editor-reviewed encyclopedia overview entries
Wildlife referenceSmithsonian's National Zoo & Conservation Biology Institute — Animals — Educational species pages from the Smithsonian Institution

Last updated: 2026-08-04