Farm-raised salmon are naturally grey while wild salmon are naturally pink due to their diet which includes astaxanthin, a compound found in krill and shrimp. Salmon farmers have to add astaxanthin to their feed to give them the pink color. It is the most expensive part of their food. – WTF Fun Facts
grey
african grey parrot that knows more than 900 words
African Grey parrot that knows more than 900 words – WTF fun facts