In other cases, in lieu of cheese, there was a menacing cartoon owl hovering above the maze, such that it behooved the mouse to reach the exit so as not to become bird food.

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Bird-lovers should leave food out and allow their garden grass to grow to create a better environment for birds to catch insects, he added.

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At the beginning, each bird gets about 3 ounces of food, which increases to 10 ounces by the end of the program, Henley said, noting that the esophagus can hold up to a liter of volume.

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Investigators from the Department of Health found no evidence that the outbreak of bird flu had anything to do with breaches in hygiene and food safety rules.

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The WHO has praised Turkey's efforts but another UN agency, the Food and Agriculture Organisation, has given a warning that bird flu could become endemic in the country.

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Historically, all the expensive and most sought-after food ingredients have been those with purported health benefits - consider bird's nest soup or sea cucumber.

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Four beef products sold by Bird's Eye, Taco Bell and catering supplier Brakes have been found to contain horse DNA, the Food Standards Agency says.

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