Which type of physical evidence is important for identifying wildlife species?

Footprints and fecal matter are vital types of physical evidence for identifying wildlife species because they provide concrete, observable signs of an animal's presence. Footprints can reveal the size, shape, and gait of an animal, allowing for a more accurate identification based on the unique characteristics of different species. Similarly, fecal matter contains information about the diet of the species, and its size and shape can also aid in identification. Together, these two forms of evidence can help researchers and wildlife managers track populations, understand behavior, and contribute to conservation efforts.

In contrast, relying solely on feathers, pictures, or sounds may limit the scope of identification. Feathers are specific to certain birds and do not provide information about mammals or reptiles. Pictures can be challenging for accurate identification if the species is not in view or if the surrounding habitat obscures key features. Sounds can also be unreliable as many species may produce similar calls, and misattributions can occur without additional evidence. Thus, footprints and fecal matter stand out as comprehensive indicators for identifying wildlife species.