Description wikipedia

The scarlet-rumped tanager (Ramphocelus passerinii) is a medium-sized passerine bird. This tanager is a resident breeder in the Caribbean lowlands from southern Mexico to western Panama. This species was formerly known as the scarlet-rumped tanager, but was renamed to Passerini's Tanager after Carlo Passerini, a professor at the Museum of Zoology of the University of Florence, when the distinctive form found on the Pacific coast of Costa Rica and Panama was reclassified as a separate species, the Cherrie's tanager, Ramphocelus costaricensis. While most authorities had accepted this split, there were notable exceptions (e.g. the Howard and Moore checklist). It was renamed back to the scarlet-rumped tanager in 2018 when Cherrie's Tanager was lumped back into the species.