During the infamous late 19th-century "bone wars", Edward Drinker Cope and Othniel Charles Marsh, desperate to one-up each other by fair means or foul, were literally hailing every fragmentary fossil find as a new species so it's a bit ironic that Marsh managed to trump himself when his majestic sounding Brontosaurus exelsus—named in 1879 and then the biggest and most complete dinosaur known, turned out to belong to his Apatosaurus—the "deceptive lizard" whose type specimen, based on partial, juvenile remains, shares its specific name with a brand of household toilet cleaner. For many years, palaeontologists battled public opinion and the US postal service (who released a stamp featuring Brontosaurus and were accused of fostering scientific illiteracy) in the hopes of burying everyone's favourite "thunder lizard" once and for all. Alas, it was all in vain as Brontosaurus exelsus was officially reinstated as a valid genus in 2015, and it brought Brontosaurus parvus (see Apatosaurus parvus below) and Brontosaurus yahnahpin (previously Eobrontosaurus yahnahpin) with it. Apatosaurus parvus is an amalgamation of two specimens—one juvenile (CMNH 566), one adult (UWGM 15556)—that were found together by Charles Gilmore in Carnegie Quarry E of Wyoming's Morrison Formation at Sheep Creek in 1901, with the smaller one being named Elosaurus parvus by Peterson and Gilmore in 1902 and the larger one assigned to Brontosaurus exelsus by John Bell Hatcher in 1901. As mentioned in the kerfuffle above, Brontosaurus and its associated species were reassigned to Apatosaurus by Riggs in 1903, but it wasn't until 2004 that Upchurch, Tomida and Barrett realised that the two Sheep Creek specimens represented the same type of critter, and they combined them as a new species, Apatosaurus parvus. Funnily enough, although the smaller specimen had already been nominated as a name-bearer, albeit of a different genus (Elosaurus), and retained its epithet (parvus) when the pair were combined, it was the larger specimen (UWGM 15556) that became the holotype. Apatosaurus parvus was renamed Brontosaurus parvus by Tschopp and Mateus in 2015.