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For years, scientists have thought frogs and toads used only six positions to mate. It turns out they may be wrong. In a forest in India, researchers say, they’ve documented a seventh.
This latest entry in the Kermit Sutra is called the dorsal straddle. Like other positions but unlike mammal sex, it’s aimed at letting the male fertilise eggs outside the female’s body.
Researchers spent 40 nights in a dense forest, finding male Bombay night frogs by listening for their mating calls and filming the action when a female showed up.
In a paper released Tuesday by the journal PeerJ, SD Biju of the University of Delhi and co-authors report what they saw:
The researchers suspect that during this ‘dorsal straddle’, the male frog deposits sperm on the female’s back. The sperm then trickles down to fertilise the eggs while she encloses them with her legs, the researchers suggest.
But a scientist unconnected to the work questions its conclusions. Narahari Gramapurohit of the Savitribai Phule Pune University in India, who studies the same frog species, said he doesn’t believe the report documents a new mating position.
In an email, he also said he doubts the sperm is delivered to eggs from the female’s back. In any case, all the frog work can come to naught. Of the 15 egg clutches the researchers monitored for the new paper, 12 were eaten by predators before hatching.
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