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Swamp rabbit
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=== Reproduction === [[File:Sylvilagus aquaticus - Brandon Johnson - 484338650.jpeg|alt=A young swamp rabbit standing on four legs among rocks and grasses|thumb|right|Juvenile swamp rabbit]] Swamp rabbits are [[Reproductive synchrony|synchronous breeders]], and tend to breed all at the same time within a population. Females will line a depression in the ground with fur and grass to form a birthing nest.<ref name="Reed-2008" /><ref name="Svihla-1929" /> These nests, also used for [[thermoregulation]], are known as ''forms'' and are common among the non-burrowing species of rabbit.<ref name="Milling-2017" /> Females give birth to [[altricial]] young—they are immobile upon birth, and only open their eyes and walk after three days. Weaning ends at 15 days, at which point the young leave the nest. They become sexually mature at seven months and reach their adult weight at 10 months.<ref name="Courtney-2008" /> Little is known about the [[Recruitment (biology)|recruitment]] behavior of juveniles into larger groups.<ref name="Nielsen-2018" /> The swamp rabbit's breeding season varies across its range. It occurs year-round in Texas, but elsewhere may take place between February and August. [[Spermatogenesis]] occurs in October and November according to a Missouri study, and in Mississippi, recorded males had descended [[testes]] more often in December and February than in any other months.<ref name="Bond-2006" /> [[Estrus]] lasts one hour following [[induced ovulation (animals)|induced ovulation]]. [[gestation period|Gestation]] lasts 37 days on average. Up to three litters are produced annually,<ref name="Heldstab-2021" /> with each litter producing one to six young. [[Embryo resorption]] can occur in ''S. aquaticus'' in response to stress, causing loss of litters. This is attributed to flooding, which can cause overcrowding<ref name="Courtney-2008" /> as well as directly inducing the release of [[stress hormone]]s.<ref name="Nielsen-2018" /><ref name="Robinson, 1983" />
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