Science Friday

A Halloween Monster Mashup, And A Spooky Lakes Tour

October 31, 2025

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  • The greater noctule bat has been documented hunting and consuming migratory birds, a behavior proven by analyzing feathers and recording audio/movement data during high-altitude dives. 
  • Camel spiders (Solifugae) are distinct from true spiders, lack venom and silk, and possess an unusual metabolic capacity allowing them to run continuously for over an hour while hunting. 
  • The tiger keelback snake is unique because it is both venomous and poisonous, sequestering toxins from its diet of poisonous toads (a process called kleptotoxism) and even being able to spray these toxins from glands on its neck. 

Segments

Greater Noctule Bat Predation
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(00:00:32)
  • Key Takeaway: Greater noctule bats capture and consume migratory birds, a behavior confirmed by analyzing DNA from feathers found in their droppings.
  • Summary: The greater noctule bat, Europe’s largest bat, opportunistically preys on birds during migration. Researchers used tiny biologgers equipped with microphones to record the bat’s interaction, capturing the bird’s distress calls followed by 23 minutes of chewing sounds. Data also showed the bat diving vertically from over one kilometer high to catch the prey near the ground.
Camel Spider Taxonomy and Habits
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(00:06:35)
  • Key Takeaway: Camel spiders belong to the order Solifugi, separate from spiders (Aranii), and are characterized by their voracious, non-venomous predatory nature and exceptional endurance.
  • Summary: Camel spiders are arachnids in the order Solifugi, lacking venom or silk glands like true spiders. They are cursorial predators that run fast and eat voraciously, sometimes to the point of bursting if overfed in captivity. A colleague observed one running continuously for over an hour in the Negev Desert, demonstrating superior metabolic capacity compared to other arachnids.
Fear of Spiders Explained
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(00:10:14)
  • Key Takeaway: The fear of spiders is amplified when humans distance themselves from nature, viewing unfamiliar organisms as inherently scary predators.
  • Summary: Fear of spiders often stems from living in environments where nature is kept at bay by asphalt and non-native lawns. When people are more integrated with the natural world, this fear response lessens. Viscerally, people recognize spiders as predators, leading to a natural wariness similar to that felt toward sharks or lions.
Venomous and Poisonous Keelback Snakes
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(00:11:58)
  • Key Takeaway: The tiger keelback snake is a rare example of a reptile that is both venomous (injects toxins) and poisonous (sequesters toxins from prey like toads) via kleptotoxism.
  • Summary: The tiger keelback snake is venomous, but uniquely, it is also poisonous because it sequesters bufotoxins from the toads it consumes, a process called kleptotoxism. These sequestered toxins are stored in neck glands and can be defensively shot out, potentially causing temporary blindness if they hit a human’s eyes. Other keelback species utilize toxins from firefly larvae in a similar manner.
Spooky Lake Science and History
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(00:17:42)
  • Key Takeaway: Spooky lakes derive their mystique from science, history, environmental disasters, and the inherent unknown beneath the surface, rather than just ghosts.
  • Summary: Spooky lakes are defined by scientific and historical elements, such as shipwrecks, dangerous water conditions, or environmental disasters. Lake Superior is terrifying due to over 400 shipwrecks and cold water that preserves bodies via saponification, exemplified by the intact corpse known as ‘Old Whitey.’ Lake Baikal, the world’s oldest and deepest lake, harbors unique endemic species, including the world’s only exclusively freshwater seal, the Baikal Nerpa.