This video from Nature Video Channel on Youtube is complimentary to a recent study showing
“… that certain body features rot away before others – and that the bits that are first to go are the most useful to palaeontologists. This decay bias makes it much more difficult to distinguish them from their ancestors and could mean that many fossils have been wrongly placed in evolutionary trees. “
Make you check out the thorough and well-written news piece by Daniel Cressey on Nature News for all the macabre details!