The announcement comes via Burger King's parent company, Restaurant Brands International. It applies to all the company's brands worldwide -including Burger King and Tim Hortons, Canada's largest restaurant chain - with a goal of accomplishing the transition in Canada, the US and Mexico by 2025.
Throughout the world, a large proportion of egg-laying hens are confined for their whole lives in wire battery cages, so small they cannot even fully stretch their wings.
Elissa Lane, deputy director for Humane Society International, said: "Burger King joining the cage-free movement in Mexico is a clear signal that the future of egg production is cage-free. We look forward to seeing Burger King set a similar timeline for its restaurants in Asia, Africa, and the rest of Latin America."
Other companies that have committed to sourcing 100 percent cage-free eggs include Grupo Bimbo, Marriott International, Nestle and Unilever. Globally, the cage-free movement includes dozens of the food industry's largest players.
