The RSPB is a nature conservation charity with a focus on birds, but it works to create habitats for a wide variety of plants and animals (mainly in the UK, but overseas too). If you're lucky, maybe you'll find a shop selling these neat little badges for a quid each. The market stall I buy my bird seed from has a box of them. A few I bought for myself and some were gifts, but I tend to mostly collect the badges of birds and animals that I've personally spotted. Anyway, I think they're fun to collect and buying one'll do nature a solid.

Mouseover / Click on the images for info about each species

foxglove Nuthatch Eurasian Red Squirrel Lapwing Fallow Deer Privet Hawkmoth Common Blue Damselfly Stonechat Eurasian Blue Tit Great Tit Small tortoiseshell Cuckoo Male House Sparrow