**Some spiders can transfer mercury contamination to land animals, study shows**

Sitting calmly in their webs, many spiders wait for prey to come to them. Arachnids along lakes and rivers eat aquatic insects, such as dragonflies. But, when these insects live in mercury-contaminated waterways, they can pass the metal along to the spiders that feed on them.

https://phys.org/news/2023-09-spiders-mercury-contamination-animals.html