The Great Yellow Bumble bee; one of the UK’s rarest bumblebees - and it can be found around Durness, pictured here on knapweed near Keoldale, you may see the pollen on its hind legs.
Bumblebees ...a little bit more info
After a long and lonely winter hibernating alone in the soil, spring marks the time of year when new queen bumblebees emerge and establish new nests.
Once a queen has selected her nest site she searches for pollen to bring back to the nest. Here she stays, shivering her muscles to keep her eggs warm as they need to stay at a constant temperature of around 30°C in order to hatch. Once the first larvae (all females, called worker bees) have hatched, the queen has a busy time travelling back and forth to the nest with pollen to feed the larvae. This is why it is vital to have a good supply of pollen-rich flowers in your garden during spring.
After around two weeks, in late spring or early summer, the larvae will form cocoons to grow into adult bumblebees and begin to emerge from the nest. The role of the workers will be to bring pollen back to the nest to help the development of the colony. At this point, the queen will be a rare sight, as she will stay inside the nest. Males [drones] do not appear until later on and either just hang around or go off wandering looking for a Princess.