Hi! These orb-waiver spiders abound in my house here in Argentina. I would like to know what are they and whether they are dangerous. I can only guess they are some kind of Argiope from some pictures I’ve found in Wikipedia and in your site.
These are Argiope Orb Weavers, but we cannot tell you what species without additional research. The smaller spider is the pair and he will live in the web with the female and eventually mate. Should you happern to learn the species name, please update us.