Deep in the tropical rainforest, scientists identify a new species of mammal closely related to the Leontopithecus rosalia. The area of initial discovery is downstream from an established local tribe and appears to be the newly discovered mammals breeding site. After researching the area further, they discover that it once housed a much larger population of this particular new species of mammal.
All of the following choices are possible reasons the new mammal population could be reducing in size; however, ONE answer choice is more likely as it has the largest impact on populations.
Of the following, which is the MOST likely cause of the shrinking population size and possible endangerment of the new species?