It’s always healthy to ask… who is the most well endowed? The answer is… IT DEPENDS!
Blue whales have the largest penises in terms of size/volume, at about 8 feet long (yipe!) but let’s remember that to get accurate measurements, SOMEONE HAS TO SIDLE UP TO THAT DORK WITH A MEASURING TAPE, so this is just an estimate.
African Elephants have the largest land animal weenie (3-4 feet/90-120 cm? longer? conflicting reports) and they can weight over 60 lbs/27kg!
Banana slugs, in particular Ariolimax dolichophallus (the specific epithet of that name meaning literally LONG DONG), can have hot dogs that are 3-5 inches/6-11 cm long… nearly as long as their body!
Most birds are dong-less, but the Argentine blue-bill duck has the longest vertebrate wang to body side ratio (about 1:1), meaning its corkscrew schlong is about 1.3 feet/42 cm long.
And the mighty barnacle! It (they are hermaphrodites) has the longest pecker to body size ratio at about 8-10:1, not 40:1 as lots of the internet claims, still impressive!
Here is some HOT BARNACLE PORN for your viewing pleasure:
Mating barnacles from Casey Dunn on Vimeo.
Sources
Sexy Science Facts 