How long animals are pregnant




















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How viruses shape our world. The era of greyhound racing in the U. And there's no rest for the weary: most sows go into heat only two to 15 hours after giving birth to a litter. Okay, octopuses don't technically get pregnant. They lay eggs. But their reproduction is odd enough to warrant a mention. Male octopuses insert packets of sperm into females with specialized arms called hectocotyli. The female can store sperm until she's ready to fertilize her average of , eggs, which she then lays and hangs around her den or attaches to the seafloor.

She then guards her eggs zealously, aerating them by fanning water over them. For dolphins, pregnancy is a literal drag. When nearly full-term dolphin mamas swim, the drag on their bodies increases by 50 percent compared to their non-pregnant counterparts. Dolphin pregnancies last about a year. Nine-banded armadillos can put their pregnancies on hold. Like several other types of mammals, including bears and badgers, armadillos practice delayed implantation.

They can hold an embryo in a dormant state until conditions are good for a pregnancy. Armadillos gestate their embryos usually four identical quadruplets for about four months, but because of delayed implantation, babies usually aren't born until 8 months after mating. It's not a huge surprise that their gestational periods are pretty similar to ours , right? Also less than a human. Interestingly, cubs might only be 6 to 8 inches in length at birth and are completely hairless.

This is the longest gestation period of any rodent. Thankfully for the mother, porcupine babies a. Baby walruses? Kind of adorable. They certainly take their sweet time coming out, though.



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