What is a defining characteristic of insectivore dental traits?

A defining characteristic of insectivore dental traits is the presence of sharp cusps for cutting through exoskeletons. Insectivores, which primarily feed on insects, have evolved specialized teeth that allow them to effectively consume their prey. The sharp cusps are designed to pierce and break the tough exoskeletons of insects, making it easier for the animal to access the nutritious soft tissues inside. This adaptation is crucial for their survival, as it enables them to exploit a food source that is otherwise difficult to digest.

In contrast, other dental traits mentioned are more suited to different dietary needs. Low, rounded cusps are typical of herbivores that require grinding surfaces for processing plant material, while long and narrow molars are often seen in animals that focus on grinding and breaking down fibrous plant matter. Thin enamel would not provide the durability needed for the intense wear that comes from processing hard-bodied prey like insects. Thus, the sharp cusps effectively exemplify the adaptation of insectivores to their specific feeding habits.