lengthening days are producing hormones in birds which stimulate the reproductive response.
Would a cardinal have more fun as a blonde? http://cardinal-blonde.html
What can I feed the cardinals to make them redder? http://bit.ly/vn2HK3
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Why male and female cardinals are a different color http://bit.ly/ueILUf
Bald Cardinals http://bit.ly/rvl06F