Humanitarian and actor Ryan Gosling wrote a critical letter to Craig Jelinek, the CEO of Costco Wholesale Corporation, following the Humane Society's undercover investigation of Costco's egg supplier.

Earlier this month, the Humane Society released a disturbing clip showing footage of chicken uncomfortably crammed into cages at a supplier. Paul Shapiro, the vice president of farm animal protection for the Humane Society, claims in the clip that Costco promised to go 100 percent cage-free with its egg supply eight years ago and still has yet to make that happen.

Warning: The video below contains graphic footage.

"Video footage revealed abhorrent cruelty including rows upon rows of birds confined in filth-laden cages with the mummified corpses of their cage-mates—eating, sleeping, defecating, and laying eggs on top of dead birds—and hens’ wings, legs, and necks trapped in the corroded wires of their battery cages," Gosling wrote. "[I]t is appalling that Costco has been selling these eggs with deceptive labeling on cartons featuring graphics of birds living out in a green pasture. You’re already eliminating cages for veal calves and pigs – don’t you feel that chickens also deserve the same mercy?"

This is not the first time Gosling has stood up for animals rights. Two years ago, he penned a letter on behalf of PETA asking the National Milk Producers Federation to stop the process of "dehorning" calves.

"Dehorning is one of the most painful things done to cows on dairy farms, whether it is by burning a calf with a searing hot iron or applying caustic paste to create a chemical burn that eats away at the animal's flesh," Gosling wrote in the letter obtained by E! News. "There is absolutely no reason—and no excuse—for the cruel, unnecessary practice of dehorning to continue ... I respectfully urge the National Milk Producers Federation to take the lead in stopping this barbaric practice by requiring farmers to phase out dehorning by breeding for polled, or naturally hornless, cattle."

Four years ago, Gosling, "New Girl" star Zooey Deschanel, and several other celebrities came together to encourage former McDonald's CEO Jim Skinner to purchase eggs from cage-free suppliers.

“After visiting McDonaldsCruelty.com and learning from my friends at Mercy For Animals that McDonald’s egg suppliers routinely torture egg-laying hens and their baby chicks, I have to tell you: ‘I’m Hatin’ It,’ ” they wrote in a joint letter. “On behalf of compassionate people everywhere, we implore you to help end the needless suffering of these animals by adopting strict and meaningful animal welfare policies worldwide, including the commitment to prohibit the purchase of eggs produced by hens who spend their miserable lives crammed into tiny wire cages.”

Skinner's rep went on to tell The Washington Post's Celebritology blog that the CEO had not received the letter and that McDonald's purchases eggs from different suppliers due to participation in a study comparing different housing systems.

“In the United States, we are a founding member of the Coalition for Sustainable Egg Supply (CSES) and are participating in an unprecedented three-year study that compares traditional, cage-free, and enriched laying hen housing systems on a commercial scale ... As a result of the study, we are purchasing a million eggs per month from each housing type,” the rep wrote in an email to the publication. “For our customers, that means we’re working with scientists and suppliers to determine the most optimal hen housing method considering impacts on hen health & welfare, food safety, environment, and other important factors.”