/sci/ - Science & Math

hey /sci/, my spibro is back.

at least, it's the same kind of jumping spider i caught before, happily working his way to my ceiling. i don't know how common it is but i keep getting visited by several spiders in my room every week, some have even be found somewhat poisonus (not by experiment). i have yet to find any web in any part of the house, even outside (but there is still a black widow somewhere inside the palms, i really get nervous sometimes when near them) . what would be a common place for spiders to reproduce, and how the fuck do they keep entering my house (2nd floor)?
pic related, it's the same jumping spider i found just a couple of minutes ago.