Grey squirrel bait for use out side for tree protection has been stopped at point of sale if you still have it you can use it but once it's gone that's it, you can still buy grey squirrel bait for indoor use, same strength, same look different bag daft but true! Warfarin and coumatetryl have come back in to fashion a little because of the reduced risk of secondary poisoning, they still kill rats you just need more than with second gen