"Yes, dinosaurs. Michael Benton, professor of vertebrate paleontology at the University of Bristol in England, says a new dinosaur species is named about once a week, on average. Another paleontologist, Thomas R. Holtz Jr. of the University of Maryland, keeps a running tally of new dinos each year for an encyclopedia he is in the process of updating. He’s up to 14 this year. In 2015, he hit 45.
"But while that rate of discovery might delight 8-year-olds, it’s not necessarily an accurate reflection of the ancient world. Eight years ago, Benton published two papers on the error rate in dinosaur species identification and found that 48.2 percent of “new dinosaurs” are eventually cast aside, deemed invalid for a variety of reasons."