Linked from
The 8 pages that link to Gestation, each with the reason it gives.
ViviparityRelated: It is the developmental interval characteristic of viviparous reproduction.
PlacentaliaRelated: Placental mammals vary widely in the duration and timing of gestation.
Indian rhinocerosRelated: A long gestation contributes to the species’ slow population growth.
Frilled sharkRelated: Its unusually long development is among the longest known in vertebrates.
Jackson's chameleonRelated: A prolonged internal development period precedes birth in this species.