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Unformatted text preview: Reasons for molt: 1. Replacement of worn feathers 2. Change the color and shape of feathers Molting cycles: Prejuvenal molt 1 st molt of a birds life natal down replaced by juvenal plumage Prebasic molt juvenal or alternate plumage replaced with non-breeding plumage. This is always a complete molt (all feathers). Usually occurs in winter Prealternate molt basic plumage replaced with breeding plumage. Usually occurs in summer. Thyroid hormones are important for all three types of molt. Molt Patterns: 1. Complete prebasic Complete prealternate (rare) 2. Complete prebasic Partial prealternate 3. Complete prebasic No prealternate...
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- Spring '09