Shrew: Difference between revisions

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[[File:Kangashrew.jpg|thumb|Most Shrews brood their young in pouches, as seen in the [[Kangashrew]].]]Shrews ancestrally brooded fetal young inside a pouch and fed them milk, much like a Terran marsupial. A handful of species have developed a placenta. Bubbleskins lost the ability to produce milk secondarily, instead feeding their offspring regurgitated blood. All shrews perform parental care, which has never been lost in any species.

Ancestrally, shrews had internal testes and mated via cloacal kiss. This state is preserved in many basal species (excluding the [[cynovenator]], which has hemipenes) and all blood shrews (including [[bubbleskins]]). The [[Beach Cheekhorn]], meanwhile, produces underdeveloped young that are then raised in the pouch in a similar manner to the majority of other shrew groups. Most living furred shrews, however ~~furred shrews~~ have similar reproductive anatomy to Terran eutherian mammals, including external testes (which is a feature also present on the [[Beach Cheekhorn]]). A notable exception to the latter is the [[tamjacks]], which re-evolved internal testes.

Ancestrally, shrews had internal testes and mated via cloacal kiss. This state is preserved in many basal species (excluding the [[cynovenator]], which has hemipenes) and all blood shrews (including [[bubbleskins]]). The [[Beach Cheekhorn]], meanwhile, produces underdeveloped young that are then raised in the pouch in a similar manner to the majority of other shrew groups. Most living furred shrews, however, have similar reproductive anatomy to Terran eutherian mammals, including external testes (which is a feature also present on the [[Beach Cheekhorn]]). A notable exception to the latter is the [[tamjacks]], which re-evolved internal testes.

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 [[File:Kangashrew.jpg|thumb|Most Shrews brood their young in pouches, as seen in the [[Kangashrew]].]]Shrews ancestrally brooded fetal young inside a pouch and fed them milk, much like a Terran marsupial. A handful of species have developed a placenta. Bubbleskins lost the ability to produce milk secondarily, instead feeding their offspring regurgitated blood. All shrews perform parental care, which has never been lost in any species.
-Ancestrally, shrews had internal testes and mated via cloacal kiss. This state is preserved in many basal species (excluding the [[cynovenator]], which has hemipenes) and all blood shrews (including [[bubbleskins]]). The [[Beach Cheekhorn]], meanwhile, produces underdeveloped young that are then raised in the pouch in a similar manner to the majority of other shrew groups. Most living furred shrews, however furred shrews have similar reproductive anatomy to Terran eutherian mammals, including external testes (which is a feature also present on the [[Beach Cheekhorn]]). A notable exception to the latter is the [[tamjacks]], which re-evolved internal testes.
+Ancestrally, shrews had internal testes and mated via cloacal kiss. This state is preserved in many basal species (excluding the [[cynovenator]], which has hemipenes) and all blood shrews (including [[bubbleskins]]). The [[Beach Cheekhorn]], meanwhile, produces underdeveloped young that are then raised in the pouch in a similar manner to the majority of other shrew groups. Most living furred shrews, however, have similar reproductive anatomy to Terran eutherian mammals, including external testes (which is a feature also present on the [[Beach Cheekhorn]]). A notable exception to the latter is the [[tamjacks]], which re-evolved internal testes.
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