Thank-you for that information.
My guess is that Ako may have a sinusitis secondary to specifically Vitamin A deficiency, and to a general malnutrition. Unfortunately, the diet that he is eating is lacking in most all important nutrients; safflower seeds are as bad as sunflower if they are fed as the base diet. Peanuts in-shell may contain fungus, so that is another possible cause of the shake, as is a foreign body in his choanal slit. He may have an internal build-up of thickened secretions secondary to lack of Vit. A.
Below is a plan to help with his overall well-being (also applicable to your MRH). The fact that he is outdoors on the one hand, is superb for his health, but on the other, may be a little dangerous because then it becomes important to consider disease transmission from wild birds.
Before you start on changing things, I would recommend that you take Ako in for an exam (I see my healthy Greys at least twice yearly to evaluate them, and for grooming) to rule out medical causes for the problem.
Happy Management Plan
As you might know, a seed-based diet is virtually deficient in Vitamin A, Calcium, and Vitamin D: all three of these nutrients are essential to any bird, but particularly to an egg-layer. A bird's feathers will look gorgeous with a seed diet, because the seeds are loaded with fat. So are nuts. Peanuts in shells are considered by some to be 'fungus factories', so please feed almonds or walnuts in shells instead.
-To convert to pellets may take upward of a year, but the results are well worth it. I prefer Harrison's (http://www.harrisonsbirdfoods.com/), but any organic pellet without additives will do. This website has a wealth of information about nutrition and conversion, so it is worth a peak even if you choose something else. Pellets should comprise approx. 80-85% of the diet. Conversion should only occur after your bird has been deemed 'healthy' by a vet. Here is the link to help you find one: www.aav.org/vet-lookup.
-Next on the list is the 'seven layer salad': (http://www.featheredfitness.com/cat/Seven+Layer+Salad.html) . Not only are these fun for your bird, but I think they are a blast to make. Your goal is to pick things laden with Vitamin A, like dark leafy greens, or red, yellow, and orange veggies. Think of fruit more like dessert. Use lots of healthy whole grains also. You may need to make food size allowance to suit your bird. Be aware however, that these salads are expensive, time-consuming, and messy for you, but tons of fun for your bird!
-Sprouted seeds have much more nutrition (they are actually healthy!) than regular seeds. Here is the site I like : http://www.chinaprairie.com/ . Once sprouted, the birds enjoy these as not only a food, but an activity as well. You can serve them as a snack, a salad dressing, or diet mainstay.
-Try a full-spectrum light bulb for 7-12hrs / day (http://users.mis.net/~pthrush/lighting/spectrum.html) . This will allow Vitamin D3 to help Calcium be absorbed, which the bird would otherwise get from direct sunlight (not filtered through glass). Calcium is extra-important in females, especially if they begin to lay.
-Mist with plain warm water at least three times weekly.
-Listen to your bird. They are wonderful communicators and we generally fail them by ignoring what they are saying because it is not easy to interpret.
Your vet may choose to give vitamin and/or mineral injections to get a jump-start on good nutrition. S/he may want to radiograph your bird to check out liver size, and run some blood tests to check for infectious or metabolic reasons. If you are worried about cost, please talk to your vet first so they can pick and choose tests accordingly.
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