Alfred Russel Wallace,
Travels on the Amazon
“ Besides this, the common silver-beak tanager (Rhamphocœlus jacapa) , some pale blue tanagers, called here "Sayis," and the yellow-breasted tyrant flycatchers are the only conspicuous birds common in the suburbs of Pará. In the forest are constantly heard the curious notes of the bush-shrikes, tooo-too-to-to-t-t-t, each succeeding sound quicker and quicker, like the successive reboundings of a hammer from an anvil. In the dusk of the evening many goat-suckers fly about and utter their singular and melancholy cries. ”
