Jan 14, 2024
Do frogs have baculae, or is that just a mammal thing?
With very few exceptions, frog's don't even have intromittent organs, so no, definitely no baculae there. Baculae are 100% a eutherian thing. But also, having the intromittent organ being the same structure as urine passes along is a very weird mammal thing as well. In most other tetrapods, excretion of urea is entirely separate from reproduction functions, and there are dedicated structures for use during copulation, if it involves intromission. And in fact, in basically all other groups, the sperm flows along a groove, or sulcus, rather than down a tube.
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