Australopithecus afarensis, also known as "Lucy", is considered a transitional species between apes and humans due to its bipedal locomotion and human-like features.

The Tyrannosaurus rex fossil, known as "Sue", was discovered in Wyoming in 1993 and is one of the most complete and well-preserved dinosaur skeletons ever found.

Archaeopteryx is a transitional fossil that combines features of both birds and dinosaurs, providing evidence for the evolutionary link between these two groups.

Yutyrannus huali, discovered in China in 2012, is considered to be the oldest known dinosaur due to its primitive features and its age, dating back to the Early Cretaceous period.

Megatherium americanum, also known as the "giant ground sloth", was a large herbivorous mammal that inhabited North and South America during the Pleistocene epoch.

Argentinosaurus huinculensis, discovered in Argentina in 1994, is considered to be one of the largest dinosaurs ever, with an estimated length of over 100 feet.

Smilodon fatalis, also known as the "saber-toothed tiger", was a large carnivorous mammal that possessed long, saber-like canine teeth.

Archaeopteryx lithographica, discovered in Germany in 1861, is considered to be the oldest known bird due to its combination of reptilian and avian features.

Mammuthus primigenius, also known as the "woolly mammoth", was a large herbivorous mammal that inhabited northern regions during the Pleistocene epoch.

Quetzalcoatlus northropi, discovered in China in 2004, is considered to be the largest known pterosaur, with an estimated wingspan of over 35 feet.

Glyptodon clavipes, also known as the "giant armadillo", was a large herbivorous mammal that inhabited South America during the Pleistocene epoch.

Archaefructus sinensis, discovered in Canada in 1984, is considered to be the oldest known flowering plant, dating back to the Early Cretaceous period.

Castoroides ohioensis, also known as the "giant beaver", was a large herbivorous mammal that inhabited North America during the Pleistocene epoch.

Juramaia sinensis, discovered in China in 1996, is considered to be the oldest known mammal, dating back to the Early Jurassic period.

Arctodus simus, also known as the "giant short-faced bear", was a large carnivorous mammal that inhabited North America during the Pleistocene epoch.