A wasp and a frog have almost nothing in common, yet scientists just discovered that both creatures independently invented the exact same chemical weapon to protect themselves from predators. Researchers at the University of Queensland made the surprising find while studying how certain wasps and frogs produce a toxin that triggers intense pain in anything that tries to attack them. For decades, scientists assumed the pain-causing molecule found in both animals was simply a modified version of a natural compound already found in the bodies of mammals, birds, and other vertebrates. The new research proved that assumption completely wrong, revealing that wasps and frogs each arrived at the identical molecular solution entirely on their own, through separate paths of evolution, with absolutely no shared ancestry connecting them.
The process behind this is called convergent evolution, which happens when two completely unrelated species independently develop the same feature because it solves the same survival problem. In this case, both the wasp and the frog needed a reliable way to make predators deeply regret attacking them, and both separately landed on a molecule that hijacks the predator’s own pain system from the inside out. When a predator gets stung by the wasp or bites the frog’s skin, the toxin latches onto pain receptors in the attacker’s body and fires off a sharp, burning sensation that teaches a very memorable lesson. Scientists confirmed that the same molecule does not affect the frogs or wasps producing it at all, meaning it was built by nature specifically to punish whoever comes after them. The discovery, published in the prestigious journal Science, is being called powerful new evidence that evolution follows far more predictable patterns than researchers realized, and that nature has a remarkable habit of stumbling onto the same brilliant answer twice.
Source: https://www.earth.com/news/wasps-and-frogs-evolved-identical-pain-toxins-without-sharing-ancestry/
