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feet and legs, having just scales but no feathers, run the risk of losing heat as blood flows through them. This is overcome with a counter-current exchange mechanism, whereby the arteries and veins intertwine, so that warm arterial blood flowing to the toes warms returning venous blood. Parrots can also reduce blood flow to one foot at a time while resting, and they will stand on one leg and raise the other up into the plumage to retain heat. This ability to stand on one leg is assisted by a ‘ratchet’ action in the tendons, allowing the locking of the limb without sustained muscle contraction. Parrots’ heart and circulatory systems, as


well as their unique lungs and air-sac respiratory cycle, all contribute to greater efficiency in blood flow and gaseous exchange compared with mammals. Dr Stafford concluded this epic


presentation by saying that “Parrots run supercharged, but they don’t burn out”. All his fascinating facts and figures demonstrated these birds’ unique superiority over mammals of a similar size


Dr Stafford concluded this epic presentation by saying that “Parrots run supercharged, but they don’t burn out”. All his fascinating facts and figures demonstrated these birds’ unique superiority over mammals of a similar size and weight, yet their potential life spans are so much longer.


34 BIRD SCENE


Mark and Marie Stafford on the right, opposite Susan Kidd, and the Saturday evening meal. Contingent from Denmark in the background.


and weight, yet their potential life spans are so much longer. Even so, in captivity, potential longevity is not always reached. A study of parrots kept in zoological collections revealed that a few individual birds had lived for 30 – 90 years, yet the average lifespan of zoo parrots was no more than 12 years. Mark Stafford undoubtedly proved his point that ‘parrots are worth conserving’, and left us all over-awed with the depth of knowledge and information presented on these fascinating birds.


DONATE TO OUR CONSERVATION FUND…


CLICK THE LINK BELOW: http://www.theparrotsocietyuk.org/donations.php


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