The spandrels of Satan's perches: evidence for the co-optation of feeding traits in the convergent evolution of mouthbrooding in Neotropical cichlids

Does the way fish feed influence the likelihood that they will evolve to use their mouths for parental care?

Winnowing in the geophagine cichlid Satanoperca daemon

Eartheaters (geophagines) are Neotropical fishes that can sift edible particles out of sand, without swallowing too much sand. How?