User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.207.108-20120910194638/@comment-203.59.10.79-20120911225618

once you get to 100hr they usually are found in pairs with one going yellow and the other going red. this is probably a male, female thing, but i don't think that capcom has ever released a statement saying they are used to attract mates.