Hunters in a web of relationships

Prey connects habitats

A global analysis by Nyffeler and Birkhofer in 2017 illustrates the scale of prey capture by spiders. These are model-based estimates with uncertainty, not a worldwide census. For local observations, the important point is that prey composition depends on the animals present and on how a spider hunts.

Hunters also become food

Birds, reptiles and other arthropods are among spiders’ predators. Spiders may also eat other spiders. Eggs and young face their own risks. A food web is therefore not a simple ladder with the spider at the top: an animal can occupy different roles in different encounters.

When a host rebuilds its web

In 2015, Korenko and colleagues described the relationship between Tetragnatha montana and the wasp Acrodactyla quadrisculpta. Before pupation, the attached wasp larva can induce altered web construction; reinforced threads later support its cocoon. This concerns a specific host–parasitoid relationship. It does not mean unusual webs generally indicate parasitism.

Beneficial predators in context

A 2019 meta-analysis by Michalko and colleagues found strong evidence that spiders suppress agricultural pest insects. Effects differed among crops and conditions. This cannot promise that one spider will keep every garden pest-free. Understanding habitats and relationships is more useful than judging animals solely by their value to people.

Sources & image credits

Sources checked: 2 November 2026. Comparisons carry the qualifications stated in each article.