The morning walk’s provided a different sensation from the learning component of the morning walk a few days back, giving me a jolt of new appreciation for all that I have no clue about related to life underwater; the jolter was an ethologist, of all things:

…The knifefishes of South America and the elephant-nose fishes … [are] both electric-producing, so they have EODs, which are electric organ discharges, and they use those as communication signals, and they communicate in some pretty cool ways. They will change their own frequency if they’re swimming by another fish with a similar frequency, so they don’t jam and confuse each other. They also show deference by shutting off their EODs when they’re passing by a territory holder…

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