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Since my little one's (T. Albo) last molt it has been extremely active. Like climbing the sides of the enclosure, not burrowing and hanging in its water dish. it is so fun to watch! At what point do they become a juvenile?
There are no written rules on when a sling turns into a juvenile. It also depends on the species and how they grow or mature. Sub-adult is usually used to indicate that the Tarantula is expected to be an adult within the next few molts (I would say 1 to 3), but again it's really hard to say and more of a guess.