Vivipary (or viviparity) ... Some mammals make nests or dens for their young, some carry their offspring around, but others do not do either of those things.

Among amniotes, genome sequences are available for mammals and birds2,3,4, ... Vivipary in placental mammals is a derived state, reflected in their loss of some egg-related genes.

In maize vivipary, the precocious germination of the seed while still attached to the ear, is the diagnostic phenotype of mutants, which are impaired in the biosynthesis or response to abscisic ...