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They're usually most active shortly after the beginning of the rainy season. The verdant grass and renewal of life brings out all sorts of animals, including the unicorn, but a more important factor are the rainbows and moonbeams that are most spectacular that time of year.

As you surely know, moonbeams are what give unicorn's their particular shine and luster, so they can often be spotted frolicking and basking beneath the glow of a full moon on a partly-mostly cloudy night.

Most people think the association between unicorn and rainbows is similarly benign, but the truth is much more sinister. Little known fact, the unicorn's horn is a leprechaun killing machine. Their violent blood feud spanning the ages is part of the reason both species are now so rare. When the rainbows are out, the unicorns go hunting.

If you're skilled at night photography, you can get some lovely shots of unicorns at play. The lighting conditions that give rise to rainbows are almost ideal for a highly romanticized play of soft light and delicate shadows... unfortunately the unicorns are usually covered in chrysochlorous ichor of leprechaun. Which sounds like it might look pretty, but it's not. Dead gods, how it's not.

So, yeah, shortly after the beginning of rainy season.