The price of eggs at U.S. grocery stores has climbed to a record high, nearly doubling from a year ago, as outbreaks of bird flu have led to shortages by wiping out millions of hens.

Eggs are being confiscated at the U.S. border with Mexico amid a bird flu outbreak that has depleted chicken populations.

As the ongoing bird influenza continues to devastate the nation’s egg production, Turkey plans to export eggs into the U.S. through July in a preliminary agreement reached between the two nations.