Number of Mexican parrots illegally (A and B) and legally (C and D) traded related to their attractiveness and the number of years the capture of each species was legally allowed in Mexico.

<p>Black dots represent the most attractive (<i>Ara</i> and <i>Amazona)</i> species, while empty dots represent other parrot species. Data are log-transformed since they fit a Poisson-like distribution. Regression lines are fitted for each group of species. Note that for panel D the best supported model related the number of traded parrots to their attractiveness and nest accessibility (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0107546#pone-0107546-t001" target="_blank">Table 1</a>), but the number of years legally trapped is shown for a better comparison with panels A–C.