Bumblebee, on raspberry flower, heavy with pollen
Bumble bees are fascinating creatures not least because of the variety in species, not only of true bumblebee but of the cuckoo bee.
A detailed, and recommended, reference work on bumblebees is: Prys-Jones, Oliver E. and Corbet, Sarah A. (1991) 'Bumblebees', 'Naturalists' Handbooks 6'. Published for the Company of Biologists by The Richmond Publishing Co. Ltd., Slough. England. ISBN 0-85546-257-4 (Paperback), 0-85546-258-2 (Hardcover).