Why Are Hummingbirds Only Found in the Americas?

Every hummingbird species alive today lives only in the Western Hemisphere. That part is simple and true right now. Go back more than 30 million years, though, and it wasn't true at all: a fossil skeleton found in a German clay pit shows a real hummingbird ancestor once hovered over flowers in what is now Europe. This is the story of what happened between then and now, and why nobody fully knows the answer.

Every Hummingbird on Earth Lives in the Americas, Right Now

The modern range runs from southern Alaska down to Tierra del Fuego at the tip of South America, with the overwhelming majority of species concentrated in Central and South America rather than spread evenly across that range. Our guide to types of hummingbirds cites the US Fish and Wildlife Service's count of 366 recognized species. A separate, frequently cited figure of 338 species comes from the 2014 phylogenetics study this article draws on for its evolutionary timeline; the difference reflects normal disagreement between taxonomic authorities over where to draw species lines, not a factual error in either source, and both numbers describe the same basic reality: hummingbirds today are found nowhere outside the Americas.

Their Closest Living Relative Is a Bird You'd Never Guess

Hummingbirds belong to the order Apodiformes, along with swifts and treeswifts, and swifts are their closest living relatives. Our guide to hummingbird senses already uses that relationship in a different context, comparing hummingbird and swift taste receptors to explain how hummingbirds evolved the ability to taste sugar. This article covers the same family tie from an evolutionary-timeline angle instead. Per Audubon, hummingbirds diverged from swifts roughly 42 million years ago, likely somewhere in Europe or Asia, a timeline independently corroborated by UC Berkeley's coverage and the California Academy of Sciences, both reporting on the same 2014 phylogenetics study.

Researcher Jim McGuire, whose lab led that study, has been candid that even with a detailed family tree in hand, the exact where and how of that 42-million-year-old split remains genuinely unresolved. Audubon quotes him describing the leading land-bridge migration theory, that early hummingbird ancestors crossed from Asia into the Americas by way of Siberia and Alaska, as "unsatisfactory" in his own assessment, since it leaves real gaps in explaining exactly when and how the crossing happened. That's a useful reminder for the rest of this article: even the parts of hummingbird evolution that are well studied still carry real, openly acknowledged uncertainty, not just the more obviously mysterious Old World extinction discussed below.

The Fossil That Complicates the Story: A Hummingbird in Germany

In 2004, paleontologist Gerald Mayr of the Forschungsinstitut Senckenberg in Frankfurt described a genuinely startling find in the journal Science: a roughly 4-centimeter fossil skeleton recovered from a clay pit near Frauenweiler in southern Germany, dated to the early Oligocene, more than 30 million years old. Per the EurekAlert summary of the announcement, the skeleton showed a specialized shoulder and humerus built for hovering flight and a bill roughly two and a half times the length of its skull, shaped for reaching deep into flowers, the same physical toolkit modern hummingbirds use. Mayr named it Eurotrochilus inexpectatus, "the unexpected European hummingbird," and called it, per Science News's coverage, "the oldest convincing record of modern-type hummingbirds." It wasn't a one-off. Additional Eurotrochilus specimens later turned up in France, including a nearly complete skeleton with preserved feather impressions, and in Poland, confirming a real population living across Europe rather than a single unlucky bird.

So Why Did They Disappear From Europe?

Nobody knows for certain, and it's worth being honest about that rather than picking an answer and stating it as settled. Per Science News's coverage of the original announcement, Mayr himself noted that "no geographic barriers... prevented the birds from spreading far and wide" across Europe, Asia, and Africa, and yet true hummingbirds vanished from every one of those regions, surviving only in the Americas. One hypothesis Mayr has floated is competition from another nectar-feeding bird group, but Audubon's coverage is direct that this is "pure speculation" in Mayr's own words, not a demonstrated cause. The honest state of the science is that this remains a genuine open question, similar in shape to other unresolved questions this site has flagged elsewhere, like exactly how high the Black Jacobin hummingbird can hear, discussed in our senses guide, rather than a mystery with a tidy answer.

Sunbirds and Honeyeaters Aren't Hummingbird Relatives, They Just Look the Part

A common point of confusion is assuming sunbirds and honeyeaters are hummingbirds' Old World cousins, since all three groups feed on nectar with long, thin bills and some show iridescent color. Per Britannica, sunbirds (family Nectariniidae, found across Africa and Asia) belong to the order Passeriformes, the true songbirds. Per Animalia.bio, honeyeaters (family Meliphagidae, found across Australia, New Guinea, and the Pacific) are also Passeriformes, more closely related to Australian fairy-wrens and thornbills than to anything resembling a hummingbird. Hummingbirds are not passerines at all. That's a genuine taxonomic gulf, not a family resemblance, and the physical similarity is a textbook case of convergent evolution, two unrelated lineages independently arriving at similar solutions to the same problem: how to feed on flower nectar. It has actually happened more than twice. Per Animalia.bio, honeyeaters' own resemblance to both sunbirds and to a third, unrelated group called flowerpeckers is likewise "the consequence of convergent evolution," not shared ancestry, meaning nectar-feeding with a long thin bill is a solution evolution has landed on independently several separate times across the world's songbirds, entirely apart from hummingbirds doing the same thing yet again from a completely different branch of the bird family tree.

The resemblance is only skin-deep in a functional sense too. Our guide to hummingbird pollination already establishes that sunbirds typically perch to feed rather than hover, which is why sunbird-pollinated flowers in Africa and Asia need a landing platform that hummingbird-pollinated flowers in the Americas don't. A peer-reviewed comparison published in PLOS ONE found hummingbirds range across a far wider band of latitude than sunbirds, from 62 degrees north to 56 degrees south versus sunbirds' 36 degrees north to 40 degrees south, and hold more species at high elevation, differences the study attributes specifically to hovering flight and specialized tongue mechanics that sunbirds never evolved.

Why the Americas, Specifically

Per Berkeley's coverage of the 2014 phylogenetics study, hummingbirds reached South America roughly 22 million years ago, likely by way of Asia and the Bering land bridge, a distant, much older echo of the long-distance routes covered in our guide to hummingbird migration. Once there, they diversified explosively into the roughly 350 species alive today, a radiation researcher Jim McGuire describes as having "profoundly affected the evolution of the New World flora." That's the same coevolutionary relationship our pollination guide documents in detail: thousands of American plant species that depend specifically on hummingbirds. The Americas aren't just where hummingbirds happen to live today. They're where hummingbirds and an entire category of New World plants shaped each other over millions of years, which is a large part of why nothing quite like a hummingbird exists anywhere else.

That radiation also explains why "hummingbird" describes such an enormous range of birds rather than one uniform shape. The California Academy of Sciences groups the roughly 350 living species into nine major lineages, from tiny bee hummingbirds to the much larger, high-altitude Giant Hummingbird, with some lineages reaching North America only much later, around 12 million years ago, and the Caribbean islands colonized independently at least six separate times starting roughly 5 million years ago. None of that diversity has an equivalent anywhere outside the Americas, which is really the same fact as the fossil story told from the other direction: not just that hummingbirds are absent from the rest of the world today, but that an entire, still-unfolding evolutionary experiment has been running in the Americas alone for millions of years.