Found this glossy pink worm in the damp soil, and it just ejected a weird white branching web from its mouth. It looks like an alien symbiote. Is it dangerous?

While ribbon worms themselves are not typically a cause for concern, there are situations where reporting unusual worm sightings might be warranted. If you encounter a worm that is significantly larger or behaves differently than typical ribbon worms, it could be of interest to local biologists or environmental agencies.

Additionally, if you suspect that a non-native or invasive species may be present, it’s important to notify local authorities to prevent potential ecological harm. Providing detailed information and photographs can help experts assess the situation and take appropriate action if necessary.