Zapdos has started to appear in Level 5 Raids across the country in Pokémon Go starting today, according to the official Pokémon Go Twitter account:
The Legendary Pokémon Zapdos has been spotted in Pokémon GO! Gather your friends and find a Legendary Raid Battle near you! pic.twitter.com/WgqXPcg9gj
— Pokémon GO (@PokemonGoApp) August 7, 2017
Might want to go out and catch one as soon as possible before Niantic accidentally swaps it out for a Pidgey or finds some other way to screw it up.