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“The fact that passerines forage on insects at animal carcasses is not a unique phenomenon, but only a few examples exist in literature,” scientists wrote in another paper on the reindeer carcasses published in Ornis Norvegica in December.

The typical Tyranninæ form a more mixed group, some species of which, such as Tyrannus melancholicus and Pyrocephalus rubineus, are prominent objects in the Argentine ornis.

The seventeenth order of Birds, Pygopodes, is represented in the Argentine Ornis by five species of Grebes.

Lastly, we come to the final order of the Neotropical Ornis in the shape of the Rheas, or the American representatives of the Ostrich-type of bird-life.

We will now take the leading groups of the Neotropical Ornis, one after another, and consider the rôle they play in the Argentine Avifauna, so as to get some general ideas as to its peculiarities.