Why do axolotls keep their frilly gills?
Quick Answer
Axolotls keep their external gills because they usually stay aquatic and do not undergo the full metamorphosis typical of many salamanders. Their gills help them breathe in water throughout life.
The Full Story
Axolotls are salamanders that commonly remain in a juvenile-like aquatic form as adults. Their feathery external gills are efficient for extracting oxygen from water, which suits the lakes and canals where they evolved. Instead of transforming into a fully land-based adult, they often keep their larval appearance and lifestyle. This is linked to altered hormone signaling, especially the thyroid axis. Their unique biology made them famous in both conservation and regeneration science.
Key Facts
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Suggested video title for this topic:
"Why the axolotl never loses its baby gills"
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