Roosters crow because they hear other roosters crowing, to show that a certain place in the barnyard is their turf, to try and assert their authority over another rooster.
Foghorn is a Blue Maran rooster and he stands close to 3 feet tall, so he is a big guy and his crow is deep in pitch and tone and he carries the crow longer than the other guys. He’s really loud!
Houdini who is a Phoenix Rooster which is a red jungle fowl stands a little over 18″ tall. His crow is higher in pitch and cuts off at the end, almost like he can’t get the last part out.