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What seems weird to me is that a specific location is actually required for Gabbits to develop their lungs. Can someone more knowledgeable in zoology than me offer any explanations? All I can think of is that the waters there are warmer or richer in nutrients.
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The wording of that passage is perplexing, because a gabbiwog without lungs would hardly be "taking a dip" in the spring, so much as swimming to it, if they were not there already. But then, maybe if they were removed or spawned elsewhere they do not complete metamorphosis until they are somehow brought there, indicating an essential environmental factor in stimulating metamorphosis. It does not seem that unlikely that even complete metamorphosis can be environmentally controlled. Especially if there is some nutritional quality in the water, from geological or extra-special (er... other species) sources. Maybe even gabbit hormones from the past/current spawning events are present in the water, and for some reason cannot be manufactured by immature gabbiwogs. I could continue to speculate later having thought more on this.
A quick look around the amphibian literature yielded:
The tadpoles of the Western Spadefoot toad Scaphiopus hammondii, who metamorphose sooner if their ponds dry up.
The same, but earlier.
This one is particularly interesting: the famous axolotl,
Ambystoma mexicanum (the original mudkip!), is a species of salamander known for neoteny- it becomes sexually mature as a "larva" and never metamorphoses into an adult salamander. It has lost the ability to metamorphose because it no longer produces
thyroid stimulating hormone which is required for it to produce thyroxine, which is what stimulates metamorphosis in salamanders. Injecting the thyroid with thyroxine or iodine can actually stimulate metamorphosis into a
full salamander (though the process is stressful and may be fatal) that resembles its close relative, the tiger salamder (
Ambystoma velasci, and some pet axolotls may be induced to do the same when stressed (ie cared for poorly), though this seems to be a rare and heritable trait. Once metamorphosed, the salamander's increased metabolism cuts its lifespan by two-thirds and robs it of its remarkable regenerative abilities (limbs, tail, eyes etc).
So yes, I'd say that it is quite possible for a gabbiwog's lung development to be externally influenced in this way, though it is quite peculiar and I would like to find out more.
Wow, gabbits sure are interesting little buggers, aren't they? I hope OWI produces more mass-spawning, metamorphosing characters.