The true Tapaculo (P. albicollis) has a general resemblance in plumage to the females of some of the smaller Shrikes (Lanius), and to a cursory observer its skin might pass for that of one; but its shortened wings and powerful feet would on closer inspection at once reveal the difference.
The existing genera include Anas, Aquila, Bubo, Columba, Cypselus, Lanius, Picus, Phalacrocorax, Sula, &c. Very interesting is the fact that Serpentarius, Psittacus and Trogon are amongst this list of birds, which are now restricted to the tropics.
Among gallinaceous birds besides the red-legged partridge, which is met with everywhere on the steppes, there are found also the Pterocles alchita and P. arenarius; and among the birds of other orders are the southern shrike (Lanius meridianalis), the Spanish sparrow (Passer cyaneus), and, the blue magpie (Cyano pica cooki).