Dunlin (Calidris alpina) - A medium-sized shorebird with a drooping bill, adult dunlin can be easily recognized while in breeding plumage by the large black patch on their otherwise white bellies. Familiar around the world, dunlin spend their winters up and down coastlines across the entire Northern Hemisphere.
Preformed vitamin A is found in animal products such as meat, fish, poultry and dairy foods. The other type, pro-vitamin A is found in plant-based foods such as fruits and vegetables. The most common type of pro-vitamin A is beta-carotene.
Vitamin A and Beta-Carotene. Retinol, retinal and retinoic acid are the forms of vitamin A with biological activity in your body. Animal foods such as fish liver oils, dairy products and eggs contain retinol in complex with a fatty acid.etinol is converted into retinal and retinoic acid in your tissues. The beta-carotene in plant foods such as dark, green leafy vegetables, cantaloupe, winter squash and carrots is converted into retinal, mainly in the cells of your small intestine and liver.