Why do pitcher plants and sundews trap bugs?

Pitcher plants and sundews trap bugs primarily to obtain nutrients, particularly nitrogen, which is often scarce in their native, nutrient-poor habitats. By luring and capturing insects, these carnivorous plants can supplement their nutrient intake, allowing them to thrive in environments where traditional soil nutrients are lacking. The trapped insects decompose and provide essential nutrients that support the plant's growth and reproduction. This adaptation is crucial for their survival in acidic bogs and wetlands.