Short Wave

How did these flowers evolve to survive a megadrought?

March 20, 2026

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  • Populations of the scarlet monkeyflower survived a multi-year megadrought through rapid evolution, specifically by genetically adapting their stomata to open less and conserve water. 
  • Dust bathing in birds like chickens is a counterintuitive but effective behavior where vibrating feathers in sand or dirt acts like 'sandblasting' to remove parasites like feather mites. 
  • Bull sharks exhibit social behavior, forming consistent associations with specific individuals, with middle-aged sharks tending to be the most socially connected within their groups. 

Segments

Scarlet Monkeyflower Drought Survival
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(00:00:21)
  • Key Takeaway: Scarlet monkeyflowers survived megadrought via rapid evolution by adapting stomata to reduce water loss.
  • Summary: The scarlet monkeyflower, a plant that dies quickly without water, survived intense drought in California and Oregon through rapid evolution. Scientists found that the best-recovering populations adapted their stomata, the plant’s pores, to open less frequently to conserve water. This adaptation allowed the flowers to ‘hunker down’ and survive the extreme dry conditions.
Bird Dust Bathing Mechanics
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(00:03:50)
  • Key Takeaway: Vibrating feathers at specific frequencies in sand effectively sandblasts and removes feather mites from birds.
  • Summary: Dust bathing, practiced by birds like chickens and ostriches, helps maintain feather oil balance and removes parasites such as feather mites. Researchers vibrated mite-covered chicken feathers in sand at 4 to 5 shakes per second, mimicking the bird’s wing movements during a dust bath. This mechanical agitation successfully caused almost all the mites to fall off the feathers.
Bull Shark Social Networks
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(00:06:18)
  • Key Takeaway: Bull sharks exhibit distinct social preferences, with middle-aged individuals forming the most central connections in their social networks.
  • Summary: Researchers studied 184 bull sharks over six years in Fiji, observing active social choices like swimming parallel or following one another. Scientists identified individuals by unique scars and swimming patterns, noting that sharks consistently associated with the same partners. Middle-aged bull sharks were found to be the hubs of these social networks, having more connections than younger or older sharks.