Calcium something = grit?
　　钙=砂土?
　　SHOULD YOU OFFER YOUR PARROT GRIT?
　　你应该喂你的鹦鹉砂土吗?
　　http://www.nuts-about-birds.com/grit.htm

　　... Parrots do not need grit
　　http://www.oldworldaviaries.com/text/lewis/eclectus-care-2.htm

　　The Truth About Grit Parrots don"t need grit and it has been known to cause
　　impaction when too much has been consumed
　　http://petplace.netscape.com/Articles/artShow.asp?artID=183

　　What about providing grit? Grit should not be provided with EXACT because it is
　　not needed for digesting this product. The high mineral contact of many grits could be harmful
　　http://www.piperspiece.co.uk/kayteefaqs.htm

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