Confused about native, non-native, introduced, and invasive species? This guide breaks down the definitions, explains how scientists classify them, and explores real-world examples like zebra mussels ...

Animals often get labeled as either predators or prey. But in the wild, survival isn’t always a one-animal job. Some species form partnerships that help them find food, avoid danger, or raise young.

Diffuse coevolution is also known as multi-species or guild coevolution. It occurs when several species collectively influence one another. An example is pollination systems in which plants interact ...

Indicator species are often the first to be affected by change in an ecosystem. Studying these sensitive animals helps scientists detect the effects of climate change and pollution early. Variable ...

The vast majority of animals need to breed to reproduce. But a small subset of animals can have offspring without mating. The process, called parthenogenesis, allows creatures from honey bees to ...