It’s almost that time of year again: when wild sea turtles seemingly appear out of the earth to lay their

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eggs on beaches around the world. Many beaches are adorned with heart-shaped hole dug into the sand, made by female sea turtles. Why? CBS News wanted to know.
They discovered their curious answer in a study published in the journal BioMed Central, with researchers using infrared thermography to study why sea turtles, such as the loggerhead turtle, prefer to lay their eggs on beaches with heart-shaped holes and not more rectangular-shaped