Possums 11-20 days
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The pregnancy span of fish, also known as the gestation period, varies depending on the species. It can range from a few days to several months. However, most fish species have relatively short gestation periods compared to mammals.
It is unknown which animal has the shortest neck. Even animals with the longest neck like a giraffes may have members with some mutation that cause a short neck, as well as other species.
Frogs have the shortest vertebral columns.
The mayfly holds the title for shortest-lived animal, with an adult lifespan typically ranging from a few hours to a few days, depending on the species.
Newly discovered species has shortest life span of any four-legged animal Labord's Chameleon (Furcifer labordi), a lizard found only on the island of Madagascar, is the first reptile species known to have an annual lifecycle Insects have very short lifespans too, Adult mayflies, depending on the species, have life spans ranging from half an hour to a whole day! 'Related' and 'Also see' links below give more details on the Chameleon and Mayfly.