Getting to the Foot of the Problem
By: Steven (SailBoat), 2016
It truly amazes me that Companion Parrots can spend nearly their entire life on their feet. The average modern Human spends, at most, several hours each day on their feet, while the average ‘kept’ Amazon spends 99.3% of each day and night on their feet. With that level of demand placed on the pads of their claws, it would only be fair on our part, to assure they have a large and varied selection of perches to choose from.
The Avian Vet Community, its supporting experts and long time Parrot Owners, have long ago recommended moving to larger perch sizes for Amazons. Today, a ‘minimum’ size perch would be 1-1/2” (38 mm) and then varying in both size and shape, up and over 3” (75 mm) in diameter using a broad selection of different natural wood perches. Parrots need to have a large selection of different size perches to choose from within and on their cage(s), play stand(s) and tee-stand(s).
A concrete perch should never be used ‘if’ your Amazon has developed foot problems, like thin/redden pads, as this type of perch will only increase the seriousness of the problem. In addition, this type of perch should never be placed in a location, which would encourage roosting. Concrete perches are best used in front of the feeding and water dishes to aid in the trimming of their nails and cleaning and shaping of their beaks.
The goal of moving your Amazon to larger perch diameters with greater variations and choices is to lessen or forestall degradation of the leg/claw structure. If your Amazon has foot problems, you should already be working with your Avian Certified /Qualified Veterinarian. It is important to note that not all Avian Qualified Veterinarians have experience with older parrots and their more specialized needs.
That is not to say that foot problems are limited to older Amazons. Spending too many years on too small and similar sized round dowel or perches can result in foot problems much earlier than would normally be expected. If your Veterinarian is not familiar with the health problems of older and/or special needs Parrots, please assure that they at least have a sound body of resource experts to call upon.
With re-homed and rescue Parrots, their history and age are rarely known. However, the wear on their claws is rarely hidden. Amazon’s that have spent too many years on too small and similar sized perches have very telling wear patterns to their pads, degrading of the muscles near the nails and/or the onset of arthritis, far too early for their sometimes ‘estimated’ age. It is very important to remember that Parrots are predominantly ‘left-footed;’ therefore it is common to see the beginning of problems in the left leg and claw. Other early signs are Night Falls and/or ‘predominant roosting’ using both legs instead of only one. A detailed examination of the leg/claw structure is a necessary part of any re-homed, rescue and/or older Parrot’s yearly physical examination.
Why are larger diameter perches healthier for Amazons to roost on? The answer is found in the structure of a Parrot’s leg and claw, which is designed to allow it to catch and hold prey and/or other food sources, much like a hand. This adaptation forces greater weight (load) on the rear-facing Digits (toes) as the diameter of the perch becomes smaller. Although, the adaptation allows the Parrot to maintain a tight grasp on a food source and smaller perches, at the same time, it increases the load on the rear pads just under and behind the connection (somewhat like a wrist) with the Tarsometatarsus bone. The smaller the diameter of a perch, the greater the load on the rear Digits and more specify their bone segments and pads nearest the joint with the Tarsometatarsus. With time, the skin thins as the pad structure crushes resulting in damaged pads, which presents pink/red in color. In addition, the natural action of roosting places the parrot’s body lower; this in turn lowers the angle in which the Tarsometatarsus and Digits join, increasing the weight on the rear Digits nearest the joint. As the diameter of the perch increases, the weight shifts slightly forward reducing the load on the rear pads under the joint, which supports the use of larger perches.
A surprising point of interest (concern?) has developed with the advent of square metal bar now commonplace in the construction of birdcages and stands. When an Amazon perches on the square bar of the cage, the rear Digits carry none of the weight! The rear Digits fall along the back surface of the square bar creating a 90-degree angle at the apex of the front and rear Digits. There exists no research on the long-term effects of Parrots perching ‘solely’ on narrow, square metal bar or narrow square-cut wood perches. From a structural standpoint, this would simply move all the weight to the front Digits, shifting the effected area from the rear pads nearest the joint, to the front pads closer to the joint. The implication would be that the front pads would degrade quicker, since they would be carrying 100% of the parrot’s weight.
The leg and claw of an Amazon is formed around a bone structure. That bone structure, plus its muscle mass and skin defines the physical size/dimension of the leg and claw. Any change in the physical size of this structure is therefore limited to one or all three components, but primarily a change in the muscle mass and/or skin. More commonly, this structure is affected by swelling (enlargement) or stiffening (limited motion) of the muscle and skin resulting from problems like; sores, cuts, infections, infestation, and arthritis (not all possibilities listed), and can also be seriously effected by underlying physical problems, the effects of toxin and chemical exposure including heavy metals and poisons, ailments like gout, neurological disorders and age progression. Arthritis will degrade bone, which is clearly a permanent change in the appearance and flexibility of the leg and claw. Although rare, the leg/claw structure can also be affected by muscle spasms.
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