Should I really?
Taken at beautiful Qianshan 千山 Mountain in Liaoning 辽宁 Province.
Literally it reads "Let us all be friends with the birds".
This is, again, a very Chinese sign, since it is not only anthropomorphizing feathered animals but it's also a classic "win the public over for a good cause"-type of call materialized in green and white. On the other hand, it doesn't feature any specific plea or order, such as "Don't feed the birds", "Don't eat the birds", "Wild animals, please don't scare them" or the like.
Suggestion: Difficult to say. I'd say "Please help preserve the wildlife". I am open for ideas.
Many thanks, Jochen!