While true for B. smithi (they are ~1/4" at 2nd instar) GBBs are actually relatively big at second instar. The largest individuals I observed were even a hair above 3/4" after molting into 2nd instar!
Yup, they seemingly thrive on neglect!
Instar is basically used to describe the developmental period of some inverts, measured by the amount of molts. Being Nth instar mans the individual had molted N times since "hatching". With tarantulas, we are mostly only concerned with the first few and the last one (for males); Most species become fully formed little predators at second instar and are typically ready to sell/ship out at that time. You will have many to choose from at the Red deer show. Not only will Dawn (Tangled in webs) be there, but Bruce (Arachnophiliacs) and Martin & Amanda (Tarantula Canada, though I'm not sure if they will personally be there). Vancouver has a couple of shows a year, and the local spider vendor recently quit the hobby, so I'm pretty jealous you get to see three big vendors in one show. A couple of other species to look out for at the show are B. Emilia, and G. pulchripes. Both slow growers, but look great when they get their adult colors, and are among the most docile.





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just got a new camera, will play tomorrow, hoping to take some pics of mine.
