Autumn spider sightings in France

Every year, large spiders become more visible in French homes during autumn, often causing concern among residents as they move around living rooms before vanishing again.

Spiders are not fleeing the cold

A common belief is that these spiders are escaping the cold from outside, but this is not accurate. The spiders seen during autumn have been living in homes for months or even since birth, and their increased visibility is due to seasonal behavior, not an external invasion.

Spiders belong to the Tegenaria genus

The spiders commonly seen in French homes during autumn are primarily from the genus Tegenaria, specifically the large domestic Tegenaria species. These spiders are not seeking shelter from the cold but have been residing in homes for a long time.

Spiders remain hidden most of the year

For much of the year, these spiders remain largely invisible because the females live in hidden, funnel-shaped refuges, often behind furniture or in basements, rarely moving except when necessary. This behavior allows them to live for two years or more.

Male spiders become more visible in autumn

The reason males become more visible in autumn is their seasonal quest to find mates. Unlike the sedentary females, males leave their hiding places to search for mates, often moving through open spaces like living rooms at night.

Male spiders have distinctive features

Males can be identified by their slender abdomen, longer legs, and swollen pedipalps, which are used for transferring sperm during mating. According to an arachnologist from the Muséum national d'histoire naturelle, Christine Rollard, this behavior can be likened to a Romeo searching for his Juliette.

Male spiders' behavior is short-lived

The male's active search behavior lasts between four and six weeks, after which he typically dies, either from exhaustion or by being devoured by the female. This behavior is part of a reproductive strategy where the male's genetic material is passed on, and the female continues to live for many more months before laying eggs.

Autumn spiders are home residents

Thus, the spiders seen in autumn are not invaders but residents engaging in a crucial part of their life cycle. Their increased visibility is due to the males' mating behavior, not an external invasion.