Fossil evidence suggests that the fearsome 'terror birds' of ancient South America may have occasionally fallen prey to giant caimans. A 13-million-year-old leg bone, belonging to a large, flightless bird, was discovered bearing distinct tooth marks consistent with those of a crocodilian. This finding indicates a complex ecosystem where even apex predators like the terror birds were vulnerable to other formidable hunters. The discovery provides valuable insight into the predator-prey dynamics of the Miocene epoch in South America, painting a picture of a dangerous and competitive environment.