Viviparity in the family Poeciliidae encompasses a continuum of maternal provisioning strategies that span from strict lecithotrophy, in which all nutrients are deposited in the egg prior to ...

A new study in Genome Biology and Evolution reveals that egg yolk proteins may have been co-opted to provide maternal nutrition in live-bearing sharks and their relatives. While giving birth to live ...

Some fish lay eggs, others give birth directly to tiny wiggly babies. According to a new Nature Communications study, giving birth to live young increased the diversity of ray-finned fishes like ...

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While giving birth to live young is a trait that most people associate with mammals, this reproductive mode—also known as viviparity—has evolved over 150 separate times among vertebrates, including ...