For example, small species such as the American Kestrel (Falco sparverius) have been found to have average respiration rates of around 134 breaths per minute, while larger species like the Peregrine Falcon (Falco peregrinus) may have an average respiration rate of around 18-20 breaths per minute.
During periods of high activity or stress, a falcon's respiration rate may increase significantly. Additionally, the respiration rate of a falcon may be affected by environmental conditions such as temperature and humidity.