It is hoped a web-like network of volunteers across the UK will help in the study of male house spiders.
Autumn is the best time of year to see the spiders and scientists at the Society of Biology have developed a smartphone app to help count the insects.
The app allows people to report their sightings of Tegenaria spiders and helps in the identification other spider species, but it is also possible to record sightings online.
House spiders in your bath are normally males who are trapped having fallen off the walls while looking for a female to mate with.
Females usually stay in their webs, which are often found under the shed, and await a suitor.
The recording scheme encourages the public to photograph and identify the spiders they find and provides information on the most frequently encountered species.
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