Brickie78: I’d be surprised if they’re “paying tribute to the deaths of 8 million horses” if the photo was taken in 1915. What I can read of the caption says they’re part of a Remount Depot (i.e. a place where horses are looked after before being sent off to front-line cavalry units), so I guess they’re just having a fun photo taken.
There was a bit of a [fad for this sort of thing](https://rarehistoricalphotos.com/living-photographs-photographs-created-assembling-soldiers-1918/), particularly in the US army around the end of the war/start of the 1920s, when they had a lot of men and not much for them to do, so they made things like the Statue of Liberty, Liberty Bell, Uncle Sam, President Wilson etc.
EnergingGenie87: It says 1915, why would the horses be dead a year into WW1
telenet_systems: I’m sure standing in that formation for a photo made it worth it to all the horses that died.
Feldjaeger63: Who counted them?