Belongs within: Columbidae.
Zenaida is a Neotropical genus of pigeons that often bear black spots on the wings.
<==Zenaida Bonaparte 1838 [Zenaidinae]B94
|--+--Z. asiaticaBKB15
| | |--Z. a. asiaticaT62
| | |--Z. a. australisT62
| | `--Z. a. mearusiT62
| `--Z. melodaBKB15 [=Z. asiatica melodiaT62]
`--+--+--Z. graysoniBKB15
| `--Z. macrouraBKB15
| |--Z. m. macrouraL81
| `--Z. m. marginellaL81
`--+--Z. galapagoensisBKB15
`--+--Z. auriculata (Des Murs 1847)BKB15, SMSP06
`--Z. auritaBKB15
|--Z. a. auritaT62
`--Z. a. zenaidaT62
*Type species of generic name indicated
References
[B94] Bock, W. J. 1994. History and nomenclature of avian family-group names. Bulletin of the American Museum of Natural History 222: 1–281.
[BKB15] Burleigh, J. G., R. T. Kimball & E. L. Braun. 2015. Building the avian tree of life using a large-scale, sparse supermatrix. Molecular Phylogenetics and Evolution 84: 53–63.
[L81] Long, J. L. 1981. Introduced Birds of the World: The worldwide history, distribution and influence of birds introduced to new environments. Reed: Sydney.
[SMSP06] Scherer, A. L., J. de F. Martins Scherer & M. V. Petry. 2006. Reprodução e análise da composição de ninhos de Zenaida auriculata (Des Murs, 1847) (Aves: Columbiformes, Columbidae) em uma unidade petroquímica no Rio Grande do Sul, Brasil. Comunicações do Museo de Ciências e Tecnologia da PUCRS, Serie Zoologia 19 (1): 29–38.
[T62] Tendeiro, J. 1962. Estudos sobre malófagos: Revisão monográfica do género Columbicola Ewing (Ischnocera, Philopteridae). Memórias da Junta de Investigações do Ultramar, ser. 2, 32: 7–460.
Zenadia macroura has the saddest song of all the birds of Florida. (In my experience, obviously.) It’s the perfect evening bird song for a exhausting summer day. A melancholy coda to stare into the sky listening to.
These were among the first birds I learned to identify.
Hence the ‘mourning’, I suppose. I did find a brief video of the call here.