Which evidence might indicate the presence of animal species in a habitat?

The presence of grazed vegetation and animal droppings is a strong indicator of animal species in a habitat. Grazed vegetation shows that animals have been feeding on the plants, which can provide insight into the types of herbivores present in that environment. Additionally, animal droppings can reveal not only the presence of animals but also their size, diet, and species, as different animals leave distinctive marks in the form of scat. This combination of grazed areas and droppings allows for a better understanding of the ecosystem, indicating both the feeding behavior and the variety of animal species utilizing that habitat.

The other options do not effectively indicate animal presence. Leaf color change might suggest environmental factors affecting plants, while soil erosion patterns can result from various climatic or geological processes rather than direct animal activity. The height of grass blades may reflect growth conditions or competition among plants but does not provide direct evidence of animal inhabitants.