Nice Acanthoscurria geniculata you've got there! It's gonna get big, some females get up to 8 inches! Some people report that their A. geniculatas are evil, hair flickin', bitey or just plain shy as hell. I have had 4. The two tha aren't spiderlings are sweethearts. Here is a pic of my little one next to the curator of hymenoptera at MSU's big one.