rom similarly large, fuzzy bees by the form of the female hind leg, which is modified to form a shiny concave surface that is bare, but surrounded by a fringe of hairs used to transport pollen (in similar bees, the hind leg is completely hairy, and pollen grains are wedged into the hairs for transport). Like their relatives the honey bees, bumblebees feed on nectar and gather pollen to feed their young. One characteristic of bees in general is that the body hairs are profusely branched making them more efficient in trapping pollen. Their mouthparts consist of a tube-like proboscis for siphoning the nectar from pants. It is coiled up when not in use.
A Bumbles Bee with Uncoiled Proboscis in Preparation for Removal of Nectar. Image Courtesy FFubs. Right. Bumblebee with Pollen Trapped on Hairs. Image Courtesy of Jesse Hickman
The brightly-colored pile of the bumble bee is a form of aposematic signal, meaning the bright coloration is a sign that I am bad-don’t mess with me (Figure 42). Depending on the species these colors can range from entirely black, to bright yellow, red, orange, white, and pink. Thick pile can also act as insulation to keep the bee warm in cold weather. Further, when flying a bee builds up an electrostatic charge, and as flowers are usually well grounded, pollen is attracted to the bee's pile when it lands. When a pollen covered bee enters a flower, the charged pollen is preferentially attracted to the stigma (female part of plant-thus fertilization occurs) because it is better grounded than the other parts of the flower.
Brightly Colored Bumble Bee. Image Courtesy Christian Sand.
Bumblebees are typically found in higher latitudes and or high altitudes; though exceptions exist (there are a few lowland tropical species). A few species range into very cold climates where other bees might not be found; Bombus. polaris can be found in northern Ellesmere Island (west of Greenland)—the northern most occurrence of any true social insect. One reason for this is that bumblebees can regulate their body te