Author: Trisha Leigh Zeigenhorn / Source: did you know?
While most people are afraid of sharks, humans also seem to have a strange fasciation with them – I mean, we look forward to an entire week of television about their antics, right?
If you’re a person who sets your DVR in advance, you’re going to be fascinated by what scientists are learning about shark gestation with the help of a new, underwater ultrasound machine.
First up, did you know some species of sharks have a left and right uterus? Neither did I. This is important because it means there can be a number of fetuses in each one.
Second, did you know shark babies are called pups? If so, you’re one up on me. (Also, I’m missing a baby shark joke in here somewhere but I’m just not sure where…).
Oh well. Let’s proceed.
For a long time, mammalian gestation was thought to be largely sedentary, with movements limited to…
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