20. Tikal National Park in Guatemala is heavily visited by tourists. Does the disturbance affect animal densities?
To investigate, Hidinger (1996) compared the densities of various bird and mammal species in places immediately next to heavily visited ruins to places in the park that were rarely visited by tourists. The mean den- sities (in animals /km? are found in the accom- panying table. The table also lists the P-value associated with a test of the null hypothesis that the two types of plots do not differ in mean density.
Which species show a statistically significant or reduction in mean density near heavily