If some worms develop slower without living longer, it becomes more plausible that there are mechanisms determining lifespan that aren't *just* a slider on developmental/growth rate.
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Other counterexamples include birds and bats (which live long relative to their body size and have high metabolisms), and naked mole rats (which live long relative to their body size but also have many children).
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If animal lifespan was strictly proportional to body size, or if long-lived-for-body-size animals were always slow-growing, slow-reproducing, low-metabolism, or hibernators, then the outlook for life extension would be pretty grim. Fortunately, that's not the case.
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