I already knew this one, and it's why I NEVER EVER donate to no-kill shelters. My money goes to my city's shelter, which is honest about having to euthanize for space.

“I’ll let you in on the secret of no-kill shelters: We had a contract with our local Humane Society that stated we’d euthanize the animals in their care that needed to be put down. One Sunday, they sent us 72 cats to put down. By the end, we were all emotionally devastated.”—Jessica Stout-Harris.