What “immune” would actually mean
A wombat’s ability to survive a funnel-web spider bite has not been established as complete immunity. Immunity would mean the venom causes no meaningful harm—not simply that an animal might tolerate a dose that could be dangerous to a person. Those are very different claims, and survival alone would not reveal how much pain, injury, or illness the animal experienced.
Venom does not affect every animal identically
Venom is a mixture of biologically active substances, and its effects depend partly on how a particular animal’s body responds to them. A dose that is highly dangerous to one species may have a different effect in another. That difference can arise from how venom interacts with the body, but a striking outcome by itself does not identify the underlying mechanism.
For wombats, the important missing evidence is a clear account of what happens after exposure: whether bites have been documented, what dose was involved, and whether the animals showed signs of poisoning. Without that, it is not possible to conclude that wombats shrug off the venom—or to explain why they might be less sensitive.
A striking claim needs a specific mechanism
Wombats do have distinctive physical and behavioral adaptations, but those do not establish resistance to spider venom. A tough body surface, for example, would not demonstrate that venom entering through a bite is harmless. The two defenses would involve different problems.
So the careful conclusion is narrower than the popular version: animals can differ in venom sensitivity, but complete wombat immunity to funnel-web venom remains unproven, and its biological basis is unknown. The puzzle is not solved by wombats’ other unusual traits; it would take direct evidence of their response to venom to show whether they have a special defense at all.
