User blog comment:PitchBlack696/Monster Hunter Portable 3rd/@comment-68.145.185.134-20110701020305/@comment-3062343-20110701030852

When looking at quests, some will have a question mark next to the icon of the monster you're hunting. When the quest ends, there will be a chance that the warning screen (the same as in the trailers) will appear, and you get an extra 50 minutes (as well as extra supplies) in which to hunt the new monster. The type of monster depends on the location of the quest, and is generally a relatively powerful monster such as Deviljho, Jinouga, Nargacuga Subspecies etc. If you fail/abandon the quest, there is no penalty (i.e. money and item rewards from the initial monster remain the same). If you manage to defeat the monster, there is a significantly higher chance of carving rare items, as well as receiving them in the rewards (I think I remember seeing that the chance of carving a Jinouga Jewel from Jinouga's body is about 10% instead of the usual 3%). This makes them useful for farming for rare items, however there is no guarantee that the monster appearing will be the one you need the item from, or even that any monster will appear (e.g. doing a Quest with the question mark in the Deserted Island may result in Deviljho, Nargacuga Subspecies, Jinouga or none of them, so if you're looking for a Deviljho Gem it may take a while to get Deviljho to appear in a Warning Quest) There is also a Warning Quest early in the game, when the player defeats their first Bulldrome, but this doesn't have the question mark like the others do. I think that's about all there is to say about them really (assuming I haven't forgotten anything).