Humans have also adversely impacted the ecology of the Everglades by introducing numerous invasive species, which may prey on or compete with native species. A spectacular and particularly damaging example of this phenomenon is the recent proliferation of the Burmese python in the Everglades, as well as elsewhere in Florida. First observed in the wild in 1979 and not again until 1995,[95] they have increased alarmingly since 2000.[96] By 2011, decreases of 87.5%, 94.1%, 98.9% and 99.3% in sightings of bobcats, white-tailed deer, opossums and raccoons, respectively, were reported in park road surveys, while rabbits were no longer being seen at all.[96]