Mosasaurs

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Mosasaur Mother and Calf

I mentioned before that I got Curiosity Stream for Christmas.  In their production, "Amazing Dinoworld" ...episode 2.  .  . we learn all about Mosasaurs.  Mosasuars descended from land dwelling lizards who laid eggs.  But through time the lizards took to the sea, developed to be viviparous, and grew to enormous size.  Viviparous means to give birth to live young.  So Mosasaurs evolved to be the top marine reptile and apex preadator of the Cretaceous oceans.

Mosasurs may have been as long as 57 feet or 17+ meters.  Mosasaurs ate fish, and invertebrates, and other marine reptiles, including other Mosasaurs.  They had around 4 or so babies with each pregnancy and the babies were not tiny either.  They were a meter long or so in the larger Mosasaur species.  Around a foot long in the smaller Mosasaur species.  

One of the interesting things that Mosasaurs did is sneak up on an Ammonite and bite their shell and then let go.  Then the disabled Ammonite was briefly eft drifting because they were "dead in the water" with a punctured shell.  The Ammonites were not truly dead, but they could not move with their air chambers puntured.  So the Ammonite was totally helpless and the Mosasaur could come and finish it off at their leisure.  This is behavior of an intellingent ambush predator.  

An interesting fact is that during the Creataceous Period the world was much warmer.  Where the mid-west of North America is was a shallow ocean during gthe Cretaceous Period.  We call it the Western Interior Seaway  Mosasaurs lived in oceans all over the world.  Mosasaurs have been found in the rocks on nearly every continent.  The places Mosasaurs are found were once flooded areas of our present continents.  They even found a species of Mosasaur that lived in rivers...so there were fresh water Mosasaurs too.  That fresh water Mosasaur was found in Hungary.

Since that unique species of fresh water Mosasaur was found in Hungary... I think I will post this in Hungarian.