I was given a tiger salamander larvae last year in May, and while the little guy is doing just fine, he doesn't seem to be any closer to morphing than when I got him. Are there any tricks to encourage him to lose his gills and come out of the water, or is it normally a long waiting game for this species? My experience with larval Ambystoma says they're usually pretty quick (unless they happen to be an axolotl of course!)