While hunting for dragonflies, I came across this bumble bee. The large orange pockets caught my eye. I have never seen this before.
When I reached home, I looked it up and found these to be pollen sacs. Bumble bees gather much pollen, compress it and store it in the baskets attached to their hind legs. For a better explanation of this process, visit: http://www.gardening-for-wildlife.com/pollen-sacs.html
Despite appearing to have a very full load, it continued to gather pollen, continuously flitting around making it difficult to photograph.