What traits make flowers attractive to nectar-eating bats?

Plants that rely on nectar-eating bats for pollination—a relationship known as being chiropterophilous—have evolved specific traits to attract these nocturnal mammals.12

Visual and Olfactory Cues

Because bats are active at night, these flowers typically open after sunset. They are often large and white, making them easier for bats to spot in the dark. Unlike flowers pollinated by insects, which may feature bright colors or intricate patterns, bat-pollinated flowers are often drab in color. To guide bats, these plants frequently emit a powerful, musky, fermented, or urinelike odor, as bats rely heavily on their keen sense of smell.13

Structural Adaptations

To accommodate a bat's face, these flowers are often sturdy and shaped like a bell or vase with a wide mouth. Some are flat and brushy to load the bat's whiskers with pollen. Plants may also position flowers on the main trunk or large limbs (cauliflory) or dangle them beneath the crown to facilitate the bat's approach.13

Nutritional Rewards

These plants produce large amounts of nectar and protein-rich pollen. The pollen often contains amino acids like tyrosine and proline, which are essential for bat health, including milk production and the development of wing membranes.31