Size of the penis itself? The Blue Whale – 8 feet long. (Human equivalent of 10 cm)
Humans? – New Yorker Jonah Cardeli Falcon – 13.5 inches erect. He is single!
Primates? – Humans! In some African countries, being said to be “hung like a gorilla” is an insult.
Vertebrates? – The Argentine Lake Duck – 2X the size of the bird! (Equivalent of human male having a 12 foot penis)
All animals? – The Barnacle – 40 times size of the animal. (Human equivalent of 240 feet long!)