The reproductive isolation among sympatric Pedicularis species is influenced by the differences of pollinator behavior and floral form via ethological isolation and mechanical isolation.
Addie said the bumble bee and the yellow bumble bee when they're not under the microscope look pretty much the same except one's bigger than the other.
TO MOST people, bumblebees are charming, slightly absurd creatures that blunder through garden and meadow with neither the steely determination of the honeybee nor the malevolent intention of the wasp.