This is a Pacu Fish. It is related to the piranha and its human-like teeth can actually grow much larger than it's relative, and can cause a nasty injury to other animals if need be.
Koalas fingerprints are almost identical to human ones, even forensic detectives have a hard time distinguishing between the two. Criminal investigations in Australia may have been hampered by the presence of koala fingerprints at the crime scenes.
An Emu egg (right) is equivalent to roughly 12 chicken eggs (left). They are also very beautiful, with a deep blue-green color and lighter blue speckles.
Once thought to be only an icy rock, New Horizons discovered Pluto is actually geologically active. From strange, bladed methane mountains to nitrogen glaciers, to ice volcanoes & now suspected presence of liquid water ocean inside the planet.