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Beauty and the Bayou

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Erin Nicholas

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“Bats look and behave a whole lot differently than mice or foxes or elephants, but nobody would argue that they're not mammals. No, bats are just a weird type of mammal that evolved wings and developed the ability to fly. Birds are just a weird group of dinosaurs that did the same thing.”

ScienceEvolutionArgumentBatsBirdsDinosaursMammals
Book:The Rise and Fall of the Dinosaurs: A New History of a Lost World
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“She shook her head, and closed her eyes. I felt her weariness then, and with it, my own. I felt it dark and heavy upon me, darker and heavier than any drug they ever gave me - it seemed heavy as death. I looked at the bed. I have seemed to see our kisses there sometimes, I've seen them hanging in the curtains, like bats, ready to swoop. Now, I thought, I might jolt the post and they would only fall, and shatter, and turn to powder.”

DarkDrugHeavyEyesWearyBatsWearinessPowderKissesShatter
Book:Affinity
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“She flies higher than she’s ever flown before, maybe she is trying to leave the earth. She isn’t sure, she isn’t thinking about it. She’s far in her mind, deep in her own thoughts, the air on her wings feels amazing, she is swimming, rolling through the air as if it’s water. She lifts her head as she flies and lets out a series of loud chirps. And that’s when she sees it. The largest bat ever. Flying faster than any hawk or eagle or owl, roaring like some sort of monster. She doesn’t know the human word ‘dragon’ otherwise she would call it that. There is no time to flee. No time to turn. No time to shriek, and no pain. It is like being thrown into the stars.”

Bats
Book:Lagoon
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“Much has been written on the excellence of bats' navigation equipment. It is all false. Tropical bats spend their entire time flying into obstacles with a horrible thudding noise. They specialize in slamming into walls and falling, fluttering onto your face. As my own 'piece of equipment essential for the field' I would strongly recommend a tennis racket; it is devastatingly effective in clearing a room of bats.”

HumourBats
Book:The Innocent Anthropologist: Notes from a Mud Hut
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“It does appear that some parts of our evolutionary process seem inevitable. It is striking that throughout evolutionary history, the eye evolved independently fifty to a hundred times. This is strong evidence for the fact that the different rolls of the dice that have occurred across different species seem to have produced species with eyes regardless of what is going on around them. Lots of other examples illustrate how some features, if they are advantageous, seem to rise to the top of the evolutionary swamp. This is illustrated every time you see the same feature appearing more than once in different parts of the animal kingdom. Dolphins and bats, for example, use echolocation, but they evolved this trait independently at very different points on the evolutionary tree.”

EyeProcessChanceHistoryEvolutionEvidenceSpeciesBatsFactDolphinsTopAnimal KingdomFeatureSwampTraitEvolutionaryRollsIndependentlyEvolvedEcholocationAdvantageousEvolutionary Tree
Book:The Great Unknown: Seven Journeys to the Frontiers of Science
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“Vast areas of old forest have been cut, or chained down with bulldozers, to make way for cattle ranching and urban sprawl. People have planted orchards, established urban parks, landscaped their yards with blossoming trees, and created other unintended enticements amid the cities and suburbs. 'So bats have decided that, as their native habitat is disappearing, as climate is becoming more variable, and their food source is becoming less diverse, it's easier to live in an urban area.”

EnvironmentDiseaseEnvironmentalGlobal WarmingPandemicBatsApocalypseCityVirus
Book:Spillover: Animal Infections and the Next Human Pandemic
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“In order to avoid the deafening of conspecifics, some bats employ a jamming avoidance response, rapidly shifting frequencies or flying silent when foraging near conspecifics. Because jamming is a problem facing any active emission sensory system, it is perhaps not surprising (though no less amazing) that similar jamming avoidance responses are deployed by weakly electric fish. The speed of sound is so fast in water that it makes it difficult for echolocating whales to exploit similar Doppler effects. However, the fact that acoustic emissions propagate much farther and faster in the water medium means that there is less attenuation of ultrasound in water, and thus that echolocation can be used for broader-scale 'visual' sweeping of the undersea environment. These constraints and trade-offs must be resolved by all acoustic ISMs, on Earth and beyond. There are equally universal anatomical and metabolic constraints on the evolvability of echolocation that explain why it is 'harder' to evolve than vision. First, as noted earlier, a powerful sound-production capacity, such as the lungs of tetrapods, is required to produce high-frequency emissions capable of supporting high-resolution acoustic imaging. Second, the costs of echolocation are high, which may limit acoustic imaging to organisms with high-metabolisms, such as mammals and birds. The metabolic rates of bats during echolocation, for instance, are up to five times greater than they are at rest. These costs have been offset in bats through the evolutionarily ingenious coupling of sound emission to wing-beat cycle, which functions as a single unit of biomechanical and metabolic efficiency. Sound emission is coupled with the upstroke phase of the wing-beat cycle, coinciding with contraction of abdominal muscles and pressure on the diaphragm. This significantly reduces the price of high-intensity pulse emission, making it nearly costless. It is also why, as any careful crepuscular observer may have noticed, bats spend hardly any time gliding (which is otherwise a more efficient means of flight).”

BatsMetabolismEcholocationWing Beat Cycle
Book:Contingency and Convergence: Toward a Cosmic Biology of Body and Mind
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