This article claims that freshwater species survived the dinosaur extinction. This could explain lake creatures which are usually seen in freshwater lakes .read the whole thing here :
http://www.livescience.com/38453-freshwater-species-survived-mass-extinction.html?cmpid=51462710164244
However bear in mind some glacial lakes such as Loch Ness only formed after the ice age because of the ice
carving up the land so don't get too excited!
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