No scientist can say which creature would rule Earth after humans. “Rule” could mean scavenging in abandoned towns, becoming abundant in a particular habitat, shaping ecosystems, or eventually developing human-like technology—and those are different outcomes. The best candidates depend on which question you mean, and none is a proven successor.
What would it mean for an animal to “rule” Earth?
There is no established ecological measure called “ruling the Earth.” A species might thrive around abandoned settlements without becoming globally dominant; another might reshape ecosystems through sheer numbers without building cities or using tools. A sudden catastrophe could also kill or severely disrupt other species, so human disappearance would not necessarily leave every candidate untouched.
Zoologist and science educator Luis Villazon put the uncertainty plainly in a 2023 BBC Science Focus Q&A: “if we disappeared, there is no particular reason to suppose that anything would necessarily step up to take our place.” The possibilities below are thought experiments based on known traits, not forecasts that any one animal will inherit humanity’s role.
Which candidates fit different kinds of dominance?
| Candidate | What it might do well | What the evidence does not establish |
|---|---|---|
| Baboons | Exploit food and shelter around abandoned human settlements in the short term. | That they would spread worldwide or develop human-like technology. |
| Crows and ravens | Manipulate objects and show cognitive flexibility, making them interesting candidates for tool-like behavior. | That intelligence or tool use would lead to civilization. |
| Octopuses | Learn, manipulate objects, and modify parts of their environment in aquatic settings. | That they could move onto land or take over humans’ terrestrial ecological role. |
| Ants and termites | Organize collectively, adapt, and influence their environments through colony behavior. | That collective organization amounts to human-like society or technology. |
Could baboons take advantage of abandoned human settlements?
In a BBC Science Focus Q&A published August 13, 2023, Villazon suggested that baboons might initially scavenge food in settlements and exploit livestock or other resources left behind. That could produce a temporary advantage in some places. It is a scenario, not an observed outcome or a prediction with a measured probability.
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Villazon also speculated that buildings and discarded tools might help baboons. But abandoned infrastructure is not automatically useful: another species would need to access, understand, and maintain it, and those advantages could fade as structures deteriorate. This is a short-term settlement question, not evidence that baboons would become Earth’s long-term dominant species.
Could birds evolve into tool-using successors?
Crows and ravens are compelling candidates if the question is cognitive flexibility and object manipulation. A Live Science overview by Joanna Thompson describes corvid cognition and tool-like object use, alongside birds’ ability to manipulate objects with their beaks and feet and to nest communally. Such abilities make them worth considering, but they do not show that birds would evolve human-style technology or complex societies.
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Evolution over long periods is difficult to predict precisely. Molecular ecologist Martha Reiskind, quoted by Live Science, said, “we’re pretty good at making short term predictions,” while the article notes that precision declines over geologic time. A plausible starting trait is not a reliable forecast of what a species will become.
Why not octopuses?
Octopuses display intelligence and can manipulate objects, but their aquatic way of life makes a transition to the land-based niche humans occupy a separate and uncertain proposition. Live Science reports cephalopod researcher Jennifer Mather’s view that octopuses are unlikely to make that transition and take over that terrestrial role.
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Earth.com’s March 4, 2026 article presents a contrasting, speculative hypothesis from Tim Coulson that octopuses might eventually develop further capacities. That is a possibility, not a finding that they will become a successor species. The disagreement illustrates why intelligence alone cannot settle the question: habitat and physiology matter too.
Could insects dominate through cooperation?
Ants and termites offer a different kind of candidate: not individual tool users, but highly organized colonies. Live Science describes ant fungus farming, termite communication through vibrations, and the adaptability of both groups. These traits support the idea that social insects could be influential and persistent in many environments.
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That is not the same as predicting a global takeover or a recreation of human civilization. Mather told Live Science, “I think that the insects are tougher than us,” then added, “Unfortunately, they’re tougher than cephalopods as well.” The comparison is an expert’s view about resilience, not proof that insects would thrive through every future catastrophe.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Would ecosystems need a new human-like ruler?
No. Ecosystems do not require one species to replace humans as a central authority. Many organisms could flourish in different places, while ecological influence would be distributed among plants, animals, fungi, and microbes rather than concentrated in a single successor.
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A 2020 global simulation study in Nature Communications examined the modeled effects of continued loss of large animals alone. It projected reductions of 44% in terrestrial heterotrophic biomass, 18% in terrestrial metabolism, and 92% in terrestrial fertility. Those figures describe modeled ecosystem effects from large-animal loss; they are not probabilities, and they do not predict what would happen after humans disappeared.
So which creature would rule?
There is no defensible single answer. Baboons could be opportunists around settlements; corvids are candidates for object manipulation; octopuses have notable intelligence but face a major habitat divide; and social insects demonstrate collective organization. Each possibility addresses a different meaning of “dominance,” and none establishes an inevitable successor.
Geologist and science writer Dougal Dixon told Live Science, “I don’t think nature will make that mistake twice.” That is an attributed opinion, not a scientific consensus. The more accurate conclusion is less tidy: if humans vanished, life would continue changing, but no available evidence shows that one creature must take our place.
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