Mosasaur
Mosasaurs (from Latin "Mosa" meaning the 'Meuse river', and Greek σαύρος "sauros" meaning 'lizard') are an extinct group of large marine reptiles containing 38 genera in total. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards known as aigialosaurs in the Early Cretaceous. During the last 20 million years of the Cretaceous period (Turonian-Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago.
New Zealand swan
The first fossil swan bones in New Zealand were recovered from Monck's Cave, Sumner, near Christchurch, in September 1889. The landowner Henry Monck had discovered bones which he presented to John T. Meeson and Henry Forbes, Director of the Canterbury Museum. They were found associated with moa and fish bones, seal hair, adzes, spears, and sinkers, indicating the swans were hunted by early Māori inhabitants of the cave. Forbes described the new swan species from three coracoids and two partial humeri, naming it "Chenopis sumnerensis", from its resemblance to the Australian black swan "Chenopis atrara" (now "Cygnus atratus") and from the type locality of Sumner. Forbes noted that "This Sumner cave has been closed since the introduction of "Chenopsis atrata" into New Zealand [in 1864–1868]" so the bones could not be from introduced black swans; he also noted that they were larger than those of the Australian species.