You can add to that list of organisms that pair and mate for life, something like 200 species of Central and South American Cichlid fishes, whose behaviour in this regard was described in detail way back in 1936 by Dr William T. Innes. They also exhibit an advanced level of parental care for their eggs and fry.
The first species to be observed in this regard is the Chanchito, Heros facetos, which was the first Cichlid species domesticated and bred in the aquarium way back in 1884. Since then, similar behaviour has been observed in a multitude of Neotropical Cichlid species.
Among the better known are the Jack Dempsey, Rocio octofasciatus, the Convict Cichlid, Archocentrus nigrofasciatus, the Rainbow Cichlid, Herotilapia multispinosa, the various Guapotes of the Genus Parachromis (of which the Jaguar Cichlid, Parachromis managuensis, is simply the best known), and such well known aquarium terrorists as Nandopsis tetracanthus, the Cuban Cichlid, this latter species being best described as âhyper-territorialâ in the aquarium.
Thereâs also the aptly named Green Terror and Red Terror, both of which are feisty species with lots of personality (most of it being strongly pugnacious), the Oscar, the various freshwater Angel Fishes (Genus Pterophyllum, and the Discus Fishes (Genus Symphysodon), this latter clade even providing nourishment for their fry from the adultsâ bodies.
The phylogenetic tree for this lot is still something of a work in progress, but the major branches are mostly on a solid footing as a result of multiple genetic analyses. If memory serves, itâs oddities like Neetroplus nematopus that are still awaiting definitive resolution, but again, they exhibit lifelong monogamous pairing and advanced offspring care.
Aquarists have been keeping and breeding these Cichlids for 130 years, and thereâs a VAST body of data on their behaviour. YouTube is littered with video footage of these fishes in action, theyâre fun to watch.
As a teenager, I kept Angel Fishes and watched them spawn. An eye opener was seeing two females pair off when they didnât like any of the males available ⌠yes, I once had a pair of lesbian fish
Quite simply, if fish can exhibit this level of sophistication, while knowing nothing of the existence of a goat herder mythology and its merely asserted cartoon magic man, we certainly donât need such superfluous dross to explain human behaviour.