http://finalfantasy.wikia.com/wiki/Chocobo_%28Final_Fantasy_XV%29 Battles
can start even while riding on a chocobo, but the party won't fight
while mounted on them. If the chocobo does not want to fight it will run
away. The chocobo's stamina depends on the things it is fed, good food
allowing them to avoid enemies, while bad food may leave them with weak
willpower and running into an enemy may have the chocobo run away
leaving the party to fend for themselves.
Chocobos can be rented in gil
for up to 30 days, and called at any time by a whistle. While riding
chocobos, the players can press the jump button again to glide. When
players dismount a chocobo, it will follow party for a while. The player
cannot raise or breed chocobos. Chocobos can be taken to camp where they receive buffs. Dashing on a chocobo is said to feature a different music track.