Carrier pigeons have become a show breed now. The eye ceres and wattles make it hard for the adult birds to see straight ahead, which negatively effects their flying abilities. Carrier pigeons have also been bred to be very long bodied and long legged, which also hurts their flying ability.
These are not mine. I don't have any carriers.
For distance and carrying messages the best pigeon breed to use is homing pigeons, which are also called racing homers. They are the fastest flying bird in the world. One homing pigeon flew 92 miles per hour in a wind tunnel for 20 minutes. Another homing pigeon averaged 126 miles per hour, for over 500 miles during a race with a very strong tail wind pushing it along. The only birds that are faster are falcons, while on a dive, where they are basically falling. On a straight flight, homing pigeons are faster.
Homing pigeons are commonly raced back from 1200 miles. The record return flight was made by a homing pigeon from Great Britain, that was sold to a loft in China. It got loose and was back in it's original home loft in 17 days.
Homing pigeons have magnetic iron in their skulls, so they can determine the earth's magnetic fields.. They can see 6 times farther than humans. They can differentiate 60 shades of red. They have UV scale vision well past humans and can see colors we can't. They can hear very low frequency sound waves, up to 1 1/2 miles long, so my homing pigeons, sitting here in Ohio can actually hear both the Atlantic and Pacific Oceans breaking against the shores.
Keith