Could someone let me know what the red and black beetles are that seem to be appearing throughout the garden? They look like ladybirds but aren't (I think). They don't fly and seem to be more active when it's sunny. I have seen them in other gardens so I know that they aren't exclusive to mine but can't seem to find anything on the internet. Are they bad for the plants and if so what's the best way to get rid of them without using chemicals if possible.