Can you tell your average buff-tailed bumblebee from its murderous cuckoo relative? Do you know which bees can sting and which can’t, or which are likely to live in a bee hotel or make their nests underground? In the run-up to World Bee Day  (on May 20), which aims to raise awareness of the importance of pollinators for food security, biodiversity, and ecosystem health, perhaps it’s time to observe the bees that visit your garden more closely and consider planting some of their favourite plants. Anyone who doesn’t really know what they’re looking for may want to bag a copy of The Bee Spotter’s Guide by bee expert Dave Goulson, founder of the Bumblebee Conservation Trust and professor of biology at Sussex University. Bees live in burrows, holes in trees and even empty snail shells. They have favourite flowers. Some even sleep curled up in the blooms, Goulson explains. “Quite a lot do that, because the males don’t typically have a nest. Flowers provide a bivouac for the night.…