If you are looking for birds related to an emu, the closest matches are cassowaries, but the wider family tree includes ostriches, rheas, kiwis, and tinamous. This guide introduces ten real species, explains how each is connected to the emu, and points out identifying traits and habitats. It is useful for birdwatchers, students, and curious readers who want more than a list of birds that simply look similar.
1. Southern Cassowary
The southern cassowary (Casuarius casuarius) is the emu’s closest living relative: both belong to the family Casuariidae and order Casuariiformes. It lives in tropical rainforests of New Guinea and northeastern Australia, where its blue skin, red neck wattles, and tall, hard casque make it distinctive. Like an emu, it is flightless, powerful-legged, and capable of moving quickly through dense vegetation; unlike the emu, it is closely associated with humid forest. Its fruit-eating habits also make it an important seed disperser, carrying seeds away from the parent plant.
2. Northern Cassowary
The northern cassowary (Casuarius unappendiculatus) is another member of the same genus and family as the emu, found in northern New Guinea. Its single red neck wattle helps distinguish it from the southern cassowary, which generally has two, although color and appearance can vary among individuals. It uses lowland rainforests and other wooded habitats, foraging largely on fallen fruit as well as some small animals. This species is worth comparing with an emu because its close relationship is genuine, even though its forest lifestyle and bright bare skin look very different from the emu’s open-country appearance.
3. Dwarf Cassowary
The dwarf cassowary (Casuarius bennetti) is the smallest of the three living cassowary species, but it is still a large, robust, flightless bird. It occurs in the mountains and forests of New Guinea and on some nearby islands, including New Britain, and has a lower, less prominent casque than its larger relatives. Its dark plumage and comparatively small size make it less immediately striking than the better-known southern cassowary, yet its classification places it among the emu’s nearest living kin. Looking at the three cassowaries together shows how closely related birds can adapt to different parts of a shared region.
4. Common Ostrich
The common ostrich (Struthio camelus) is not as close a relative of the emu as a cassowary, but both are large, flightless members of the palaeognath group. Ostriches are native to Africa and occupy open habitats such as savannas and semi-arid plains, rather than the emu’s Australian range. They are the largest living birds and are unusual among living birds for having two toes on each foot; an emu has three. The ostrich is a useful comparison for understanding how separate flightless lineages share features such as strong running legs while retaining clear anatomical differences.
5. Greater Rhea
The greater rhea (Rhea americana) is a large, flightless South American bird that belongs to the same broad palaeognath group as the emu. It ranges across open grasslands, scrub, and agricultural landscapes in parts of eastern and central South America, where its gray-brown plumage helps it blend into the ground. A notable feature of its breeding system is that one male may incubate eggs laid by several females and then care for the hatchlings. Rheas resemble emus in their long legs and ground-dwelling habits, but their native continent and family classification set them apart.
6. Lesser Rhea
The lesser rhea, also called Darwin’s rhea (Rhea pennata), is a smaller South American relative of the greater rhea and a more distant relative of the emu. It inhabits open, often cold or dry landscapes in the southern Andes and Patagonia, including steppe and scrub country. Its feathers extend farther down the legs than those of the greater rhea, a useful field mark, and it can run quickly across exposed ground. Like other rheas, it is flightless and has a breeding system in which males take the leading role in incubating eggs and tending young.
7. Great Spotted Kiwi
The great spotted kiwi (Apteryx haastii), also known as roroa, is a flightless palaeognath native to New Zealand’s South Island. It is generally considered the largest kiwi species and lives in forest, scrub, and alpine-edge habitats, where it searches the soil for invertebrates. Its long bill has nostrils near the tip, helping it locate food by smell, a striking contrast with the emu’s more typically sight-oriented foraging. The kiwi is related to the emu through the ancient palaeognath branch, but it belongs to a distinct island lineage and has adapted to nocturnal life.
8. North Island Brown Kiwi
The North Island brown kiwi (Apteryx mantelli) is found on New Zealand’s North Island and is another flightless member of the wider group that includes emus. Its shaggy brown feathers, sturdy legs, and long bill suit a life spent probing leaf litter and soil for worms and other invertebrates, mostly after dark. Kiwis are unusual among birds for relying heavily on smell when foraging, with nostrils positioned close to the end of the bill. This species is worth including because it shows how a distant emu relative can become highly specialized for a forest-floor niche.
9. Little Spotted Kiwi
The little spotted kiwi (Apteryx owenii) is the smallest kiwi species and one of the most distinctive examples of how varied palaeognaths can be. It is native to New Zealand, and conservation translocations have established populations on predator-managed offshore islands, including Kapiti Island. It has rounded, mottled gray-brown plumage and feeds at night on small invertebrates found in soil and leaf litter. Like other kiwis, it cannot fly, but its small size and island history make it quite different in appearance and ecology from an emu, despite their shared deep ancestry.
10. Elegant Crested Tinamou
The elegant crested tinamou (Eudromia elegans) is a ground-dwelling bird of southern South America, especially open scrub and dry country. Unlike the emu, it can fly, though it usually spends much of its time walking and foraging on the ground; its long, backward-curving crest makes it easy to recognize. Tinamous are palaeognaths, so they belong to the same broad evolutionary group as emus, ostriches, rheas, and kiwis, even though they are not usually called ratites. This makes the species a useful reminder that not every close evolutionary connection means a bird is flightless or physically emu-like.
How to Choose
Start by deciding what you mean by “related.” If you want the closest living relatives, focus on the three cassowaries: they share the emu’s family, Casuariidae. If you mean birds connected through a broader branch of the family tree, then ostriches, rheas, and kiwis are also relevant, while tinamous add an especially useful contrast because they can fly. A bird’s size or long legs alone do not tell you how closely it is related to an emu.
For identification, compare a combination of traits rather than relying on one feature. Note the bird’s range, habitat, feet, plumage, and any distinctive head features: ostriches have two toes, cassowaries have casques and colorful neck skin, and kiwis have long bills with nostrils near the tip. Rheas are South American birds of open country, whereas cassowaries are forest birds of New Guinea and northeastern Australia. These differences can help narrow down a sighting far more reliably than a general impression of “large and flightless.”
For research or a school project, decide whether you need taxonomy, ecology, or a visual comparison. A family-tree comparison makes cassowaries the clearest choice; a habitat comparison could set an Australian emu beside a South American rhea or an African ostrich. If you are choosing birds to observe in the wild, use local wildlife guidance and keep a respectful distance, particularly around large birds with strong legs. Also check the scope of your source: common names and species classifications can change, so scientific names help make sure you are comparing the intended birds.
Frequently Asked Questions
What bird is most closely related to an emu?
Cassowaries are the emu’s closest living relatives. Emus and cassowaries belong to the same family, Casuariidae, and order, Casuariiformes.
Are ostriches and emus in the same family?
No. Ostriches and emus are in different families and orders, but both are palaeognaths and both are flightless. Their similarities reflect shared ancestry and adaptations to life on the ground, not membership in the same family.
Are all birds related to emus flightless?
No. The elegant crested tinamou can fly, although it often forages on the ground. Flightless emus, cassowaries, rheas, ostriches, and kiwis are other examples from the wider palaeognath group.
Is a rhea basically a South American emu?
That is a handy visual comparison, but not a precise classification. Rheas and emus are separate lineages with different native ranges; the greater and lesser rheas live in South America, while emus are native to Australia.
Do emus and cassowaries live in the same places?
Emus are native to Australia, while cassowaries occur in New Guinea and, in the case of the southern cassowary, northeastern Australia. Their ranges overlap in part of Australia, but their preferred habitats differ: emus commonly use open country, and cassowaries are associated with forest.
Final Thoughts
The cassowaries are the best answer when the question is about an emu’s closest living relatives. Ostriches, rheas, and kiwis offer wider comparisons among flightless palaeognaths, while tinamous show that this ancient group includes birds capable of flight. Comparing scientific names, habitats, and physical traits makes the family connections easier to understand—and keeps resemblance from being mistaken for close kinship.