1 - Messenger. PidgeonsPigeons sent information but had to fear hawks. I would like to see a hawk intercepting mail when the messenger is badder and meaner than them.
Also, the intelligence would allow for training, and with some selectingselective breeding, lighter breeds for more speed.
Use as pack animals areis limited since the food would be a nightmare for logistics onen masse. Yet as the occassionaloccasional piece of meat for dedicated roles, would be a great boon.
2 - Attack wooden ships. You can set sails aflame with a modest strike force in the middle of the night, and then have them return.
3 - Light riders. You can make a saddle for kids and even a young boy could say "a lot of people in the woods."
4 - Rope bridges. Having intelligent flying elements enables field engineers to create structures with greater ease.
5 - Parrots and Elephants both can count. Teach them to count ships and repeat the number striking against the floor. Four strikes, four ships.
6 - Disrupting communications. Have them attack enemies using messenger pidgeonspigeons.
7 - Give them ceramic pots with nasty contents. The guy flies and drops stuff. Easy peasy-peasy to teach.
8 - Carry light supplies across positions. Give them satchels with parchment, light rations, medicinal supplies..... And relieve a regiment cuttofcut off from main supply lines on the other side of a river.