Bumble Bee Mouth Parts
Most bumble bees, except for the young queens, have only a few weeks left to live, but until a killing frost arrives, they will be gathering pollen and nectar for themselves and their colony. The various mouth parts that enable them to collect food are hidden behind the large lip that you see when you face a bumble bee head on.
Behind this lip, there are multiple structures that are adapted to grasp, shape and collect food. These include jaws, or mandibles, which clasp pollen and wax used to form cells for eggs. Under the mandibles are two long sheaths that also grasp and shape food called maxillae. Two labial palps located under the maxillae serve as taste sensors. Both of these structures, the maxillae and palps, form a horny sheath which protects the bee’s tongue.
Nectar is accessed with a proboscis which is basically a tube that is protected by the mandible, maxillae and labial palps. A tongue-like structure called a glossa protrudes from the proboscis. Its hairy tip is well suited for collecting nectar.
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A Butterfly’s Proboscis May Act More Like A Paper Towel Than A Straw
The chewing mouthparts of a butterfly larva, or caterpillar, undergo changes when the larva develops into an adult butterfly. They are turned into a tube consisting of two parts, or galeae, that when joined form a structure called a proboscis. The proboscis looks like a straw, and has long been thought to act like one. It is often referred to as a sipping tool through which nectar is obtained by butterflies. However, recent discoveries have scientists thinking that the proboscis works more like a paper towel than a straw.
The liquid that a butterfly feeds on in addition to nectar – animal tears, juice inside decomposed fruit, tree sap, sweat, liquid contained in scat – is so viscous that sipping or pumping it through the proboscis, or feeding tube, would require an enormous amount of pressure. It’s been suggested by entomologist Konstantin Kornev of Clemson University that butterflies draw liquid upwards using capillary action – the same force that pulls liquid into a paper towel. The proboscis actually resembles a rolled-up paper towel, with tiny grooves that pull the liquid upwards along the edges, carrying along the bead of liquid in the middle of the tube. (Photo: Sulphur Butterfly on New England Aster)
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