well, since we're on the whole genitalia thing:
Most marsupials, except for the two largest species of kangaroos, have a bifurcated penis. That is, it separates into two columns, and so the penis has two ends. I'm awaiting a sick comment about that one.
The barnacle has the longest penis for its own length: up to twenty times the length of the animal. Because of it sedentiary lifestyle, it has to feel around with its penis to find females around it. It also discards its penis annually and grows a new one.
Elephants have rather long skinny penises which they actually have motor control over much like an arm - this is because due to the size of the animal, simply sticking it in during mating is not very effective and they must feel around for the elephant-gina. I have actually witnessed this on a discovery channel show and man was it weird.
In the realm of absolute size, the smallest penis belongs to the common shrew (5 mm or 0.2 inches). The largest penis belongs to the blue whale estimated at over 2 m (about 6 feet). Accurate measurements are difficult to take because the whale's erect length can only be observed during mating (wouldn't want to get in the way of that!)
The Icelandic Phallological Museum is devoted entirely to collecting penis specimens from all the land and sea mammals living in Iceland. The museum has received a legally-certified gift token for a future specimen belonging to Homo sapiens.
Gorillas have relatively small penises, so it is an often used subtle insult in countries such as Australia to insinuate or directly state that one is 'hung like a gorilla'. Chimpazees actually have larger penises than gorillas...
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