Emperor Penguins

This is probably the most romantic story you'll read in this slideshow, even if it's fairly strange. Most penguin couples are survivors of long-distance relationships and spend most of the year apart--only meeting once in late-March. Penguins search for their mates by listening for their bugle call. 

They then mate in an extremely awkward position--lying flat on top of each other passing sperm through the same orifice that they use for defecating--until the egg is laid. Then the female passes it very carefully to the male who keeps it warm under a fold of its skin, till it hatches. The females then leave for about 2 months leaving the males to huddle together. When they finally return, the females find their mate again by listening for their bugle call over all the others! All in all, it seems like the male emperor penguin is quite possibly the most monogamous male species on the planet!