As plate tectonics

[taixyz1992]

As plate tectonics theory took hold, oceanic dispersal fell out of favor and was even considered by many researchers to be "miraculous" if it occurred.[26] Despite the low likelihood of its occurrence, oceanic dispersal remains the most accepted explanation for numerous vertebrate colonizations of Madagascar, including that of the lemurs.[26][31] Although unlikely, over long periods of time terrestrial animals can occasionally raft to remote islands on floating mats of tangled vegetation, which get flushed out to sea from major rivers by floodwaters.[13][30][32]
Any extended ocean voyage without fresh water or food would prove difficult for a large, warm-blooded (or "homeothermic") mammal, but today many small, nocturnal species of lemur exhibit heterothermy, which allows them to lower their metabolism and become dormant while living off fat reserves. Such a trait in a small, nocturnal lemur ancestor would have facilitated the ocean voyage and could have been passed on to its descendants.[32] However, this trait has not been observed in the closely-related lorisiforms studied to date, and could have evolved on Madagascar in response to the island's harsh environmental conditions.[13]


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