If you’re ever feeling lonely at home, you can now rest assured that you are far from alone. The average home is crawling with more than 100 species of invertebrates, such as spiders, lice and centipedes, according to research conducted by US scientists.

In what’s thought to be the first study to quantify exactly what is scurrying or flying around the standard American home, researchers scoured 50 houses and found they were inhabited by 579 different types of arthropods, as well as humans. Arthropods are invertebrate animals with segmented bodies and jointed limbs, such as insects and spiders.

The homes, on average, each had around 100 arthropod species. The most commonly found species were flies, spiders, beetles, ants and book lice. Cobweb-producing spiders were found in 65% of the homes.

Matthew Bertone, an entomologist at North Carolina State University, said he was amazed at the variety of species found in what he stressed were “clean and normal” homes in Raleigh, North Carolina.

Read the article “Study: Hundreds of Arthropod Species Crawling Through US Homes” on theguardian.com.