Birdsafe weedkiller for lawns?

Hi, 

Just wondering if anyone can recommend a weedkiller for lawns that is safe for birds? I have a lot of birds feeding in the garden every day but also have a lot of weeds Frowning2️ I had been sort of keeping on top of the dandelions, dock and plantain just by hand weeding, but now creeping buttercup has arrived and last summer was beginning to take over from the grass entirely so I need to get rid of it. There’s way too much to hand weed or spot treat with vinegar etc. 
Any suggestions?

 Thanks!