Darwin overwhelmed by tropics

In England any person fond of natural history enjoys in his walks a great advantage, by always having something to attract his attention; but in these fertile climates [near Rio de Janeiro], teeming with life, the attractions are so numerous, that he is scarcely able to walk at all.

Charles Darwin, The Voyage of the Beagle (London: John Murray, 1913 reprint ed., ch.II, p. 27