The mountain rescue groups and the lifeboats, those too I give to. Not on any formal basis, but if presented with an appeal or spot the rattling can on a counter, I donate.
I think a lot of people are like that in their giving. It's not always formalised and it's often seasonal....the Poppy collections for instance, or the Christmas ones for homeless youths.
I do give to the SSPCA....who are you going to call if you find an injured animal or bird ? A deer on the road, hurt but still breathing is not uncommon, buzzard with a damaged wing ? round here the SSPCA (RSPCA further south) come out and deal, thankfully.