In the middle of the night in a humid coastal rainforest, a litter of pink, hairless babies snuggle with their mother. They stir and squeak for milk, their mother obliges, and they are sated. But these are no puppies or cubs. They are snake-shaped amphibians, far closer to frogs than foxes.. The long, cylindrical creatures are the first egg-laying amphibians known to feed hatchlings this way.
The team also examined the internal anatomy of some of the adult female caecilians and analyzed the nutritional and biochemical makeup of the nutritional fluid. It is secreted by glands in the mother’s oviduct that enlarge while raising her hatchlings. It’s also rich in fats, much like mammal milk. This nutritious resource may help explain how the hatchlings grow so fast — bulking up their mass by up to 130 percent, an additional 0.
“In mammals, lactation is the most expensive stage of reproduction for the mother,” she says. “It would be useful to study whether milk production is as expensive in caecilians too. How is the mother impacted in the short- and long-term?”
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