...on Masafuera, endemic subspecies of Red-backed Hawk
Buteo polyosoma exsul and Grey-flanked Cinclodes
Cinclodes (oustaleti) baeckstroemii occur... Both are candidates to be split as full species. ...
...
Red-backed Hawk
The local subspecies
exsul differs from the continental birds in occurring in only one morph, that furthermore only occurs in
exsul (
Farquhar 1998). ...
...
Grey-flanked Cinclodes
... This subspecies is a potential split, because of its differences in morphology and vocalizations form [
sic] the continental taxa (
Hahn 2006). ...
...
De Filippi's Petrel
...
Reasons for out-of-season occurrence off Chile (including Juan Fernández archipelago) ...
...raises the question if De Filippi's varies geographically and if perhaps more than one taxon is involved. A complication for future research may be that the type specimen of De Filippi's was collected at sea off northern Chile (Giglioli & Salvadori 1869). It may be impossible to relate this type and its morphological characteristics to any of the known populations without extensive study.
