As you may already know, Pokémon GO has a special event going on where players can battle and catch four out of the five legendary birds. So far, only Articuno and Lugia have been made available, but Zapdos and Moltres are on their way. Now we know when they'll be here and for how long.

In a recent Twitter post, Niantic revealed that Articuno, which has already been made available, will stick around until July 31. Moltres will be next up, starting off on July 31 and ending on August 7. Then, it will be Zapdos' turn from August 7 to August 14. Lugia doesn't seem to have a limited time as of right now, and there doesn't seem to have been any clues as to when and where we might find Ho-oh. With any luck, this should allow all of you trainers plenty of time to catch one or two of these monsters for your collection.

Recently, Niantic ran into a little technical trouble at its Chicago Pokémon GO Fest. The developer commented by saying that it was "horrified with the results," and even went as far as refunding admissions to the event and compensating attendees with $100 in PokeCoin.