Juvenile Harpy Eagles have been seen in Mexico and Argentina for the first time in decades, signalling potential breeding at the edges of their historical range. These rare observations offer hope for ...

1 Introduction. The two largest raptors in the Brazilian Amazon, Harpy Eagle, Harpia harpyja (Linnaeus) and Crested Eagle, Morphnus guianensis (Daudin) occur at low densities and are hard to detect in ...