Table 3. Comparison of the number of vertebrae per region of Andalgalornis with selected taxons with and without bifurcated neural spines.

	R1	R2	R3	BNS	T
Andalgalornis	5v	4v	4v	5v	13
	38.46%	30.76%	30.76%	38.46%
Rhea	5v	9v	3v	6v	17
	29.41%	52.94%	17.64%	35.29%
Chunga	5v	6v	2v	absent	13
	38.46%	46.15%	15.38%	−
Theristicus	5v	7v	5v	8	17
	29.41%	41.17%	29.41%	47.05%
Buteo	5v	4v	5v	absent	14
	35.71%	28.57%	35.71%	−
Tyto	5v	4v	4v	absent	13
	38.46%	30.76%	30.76%	−
Ramphastos	5v	5v	4v	absent	14
	35.71%	35.71%	28.57%	−
Cygnus	12v	9v	2v	absent	23
	52.17%	39.13%	8.69%	−
Nycticorax	5v	8v	4v	absent	17
	29.41%	47.05%	23.53%	−
Rhynchotus	5v	8v	3v	absent	16
	31.25%	50%	18.75%	−
Larus	5v	5v	3v	absent	13
	38.46%	38.46%	23.08%	−

BNS vertebrae with bifurcated neural spines, T total vertebrae of the neck, v vertebrae.