Time & again we are told that animals evolved from lesser evolved things in the hierarchy of deep time & blind chance. Genetic discrimination off-loading junk as a more supreme being more ably suited sets its foot or fin or whatever onto the face of the earth.
More often than not we are given dubious debatable relics from the not so distant past with a great lack of transition fossils to support the case. More recently we have been told that elephants losing their tusks are evidence of evolution when in fact it is not.
It is not science that makes evolution tick, but tricky stories that confound & confuse.