Elephant Seal and Pup on Beach (IMAGE)
Caption
A female elephant seal and her pup on a beach near Big Sur, California. Seals and other pinnepeds are among the mammals whose early-stage embryos can enter diapause -- a temporary dormant state -- and then implant and develop later. The timing of pregnancy and birth are thereby postponed to occur when conditions are more favorable for survival.
Credit
Alice C. Gray
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