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Date:11/26/2014 12:12:23 AM
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Hi Cu-Bird
I know, I know, that's a mammal down there! We are still in DITT, never fear, but we're talking about other things today. You already know that mammals began to evolve when the dinos did, about 230mya. Well, we're entering the Cretaceous, so I wanted to bring you up to date about the mammals, too. There were many kinds of mammals in the mesozoic, but today there are only 3 kinds left. The first pic shows a model of eomaia scansor, the first placental mammal ever discovered so far. If you look in the second pic, that's her fossil on the far right. Why is that important, you ask? Well, we know dinos didn't live alone on the planet, there were pterosaurs, crocodilians, fish, amphibians, insects, and yes, mammals, not to mention all the living things in the oceans. So today is just a reminder about other animals who lived with the dinos.
I chose to highlight eomaia though, because it is the first identified placental mammal. Its name, eomaia, means 'dawn mother' and that she is. We are, after all, placental mammals, too, so she's a distant relative.
Oh, I bet some people are thinking about the 3 kinds of mammals on earth today: they are monotremes, marsupials, and placentals. The monotremes lay eggs and kind of ooze milk on their abdomens, where the babies can lap it off. There are only 2 of these, the echidna and the platypus. Marsupials give birth prematurely to fetuses with basically feet and mouths. They crawl into mom's pouch and latch onto a nipple, which grows with them as they mature. They leave the pouch when they are better developed. The third kind is US! Also, horses, mice, etc. Placental moms give birth to fully developed young which still need care for some time, but have been protected throughout gestation. Okay, that's all for today, thanks for your continued support, and see you tomorrow with another vote for you and a big hug. Gizmo
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