Home to some 1,000 bird species, Argentina has nearly twice as many as Europe: tropical parulas, rufous horneros, scarlet-headed blackbirds, and Chilean flamingos. In B.A. the best viewing spots are the Reserva Ecológica Costanera Sur (54-11/4893-1588), in Puerto Madero, and the 25-acre Refugio Natural Ribera Norte (54-11/4747-6179), in Acasusso. Go with expert and guide Alec Earnshaw ($ weekend half day, $150; 54-11/4790-5284) or Lihué Expeditions (half day, $300; 54-11/5031-0070), which gives birding trips by kayak on the Tigre.
$ Establishment accepts no charge/credit cards or accepts cards other than the American Express Card.