That includes "kill two birds with one stone", "bring home the bacon", and "take the bull by the horns"-phrases rooted in what PETA terms "speciesism", or discrimination based on species membership".
The last scenario is what is now playing out in the Twittersphere, as PETA took to its account to tweet about how we should remove "speciesist" language - language that is unfriendly to animals - from our vocabularies. It included suggested replacement phrases for common phrases that the organization says are harmful.
They also say people should stop saying "kill two birds with one stone", and say "feed two birds with one scone" instead. Things like beating a dead horse, which PETA thinks should be replaced with "feed a fed horse". Thousands of people replied to PETA's tweets, complaining about the comparison.
For instance, rather than saying, "bring home the bacon", PETA suggested saying, "bring home the bagels".
PETA has been heavily criticised for comparing "speciesism" to racism, homophobia and ableism. "To everyone else: add your own anti-speciesist phrases below!"
As might be expected, the backlash from skeptical Twitter users was swift, with hordes of people responding in their own tweets that PETA's campaign against some of America's most common phrases is ridiculous.