Solvin Zankl (Germany) carefully watches a two-coloured mason bee build the roof of its nest. While exploring a favourite haunt in central Germany, Solvin came across several tiny piles of sticks on ...

Not every bee lives in a hive and makes honey. But some of those other bees are necessary for a healthy garden. Mason bees, for instance, are small native bees with 150 species found in North America.