7 of the largest in nature

1. The Blue Whale is the largest animal alive
2. The Barnacle has the largest penis in relation to it's body size
3. The Vampire Squid has the largest eyes relative to its size
4. The Wandering Albatross has the largest wingspan at 3.63 metres
5. The Greater Kudu Antelope has the longest horns of any animal (on average)
6. The largest species of bacterium ever discovered is Thiomargarita namibiensis, which grows to 0.75 mm in diameter
7. Humans have the largest brains in relation to body size