Twenty-seven thousand years ago, a human parent or parents buried their ten-month-old twins. They decorated their babies with red ochre and jewellery, and sheltered them under the shoulder blade of a mammoth. The huge animal scapula protected the infants, and their well-preserved remains were uncovered in Austria in 2005. (Another child was buried nearby). I recently came across this piece about the sad pair in Scientific American, written in 2006. Live Science has good pictures. The find was originally reported in Nature.