World Gorilla Day falls on the anniversary of the founding of the Karisoke Research Center in Rwanda in 1967. The day celebrates gorillas and the people who study and protect them.
A mature male develops the silver-gray hair that gives a silverback his name. Gorillas also have individual patterns of wrinkles around their nostrils. Researchers can use these noseprints to recognize animals in the field. See how many differences you can spot if you compare two close-up photographs.
About the observance
https://www.worldanimalprotection.org/our-campaigns/sentience/animal-awareness-days/world-gorilla-day/
More about the featured species
https://gorillafund.org/wp-content/uploads/2021/04/Gorilla_Fact_Sheet_Part_1-1.pdf