Weed killer that won't harm the garden birds

Hi,

The weeds in my garden are just getting too out of control so I am contemplating resorting to using weed killer. However, I do not want to put down anything that will harm the garden birds. Can anyone recommend one which is non-toxic and won't cause them any harm? And perhaps recommend somewhere in Dublin I can get it? If there isn't one available I'll just keep pulling them!

Thanks

Mods, I wasn't sure about whether to put this in this forum or in gardening but since the safety of the birds are my main concern I went with this one. Apologies if it needs to be moved.