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uncountable
A form of pseudocopulation, found chiefly in amphibians and horseshoe crabs, in which a male grasps a female with his front legs as part of the mating process. quotations examples
Finally, we came upon a pair of Panamanian robber frogs locked in amplexus—the amphibian version of sex.
2014, Elizabeth Kolbert, chapter 1, in The Sixth Extinction: An Unnatural History, Henry Holt and Company
In the middle, just below the surface, a male and a female were locked in amplexus, a coupling that can last for days as the male waits to fertilise the eggs when they are laid.
2018 March 29, Ed Douglas, “Country diary: tantric embraces and nuptial pads – the secrets of frog sex revealed”, in The Guardian