Table 3.

Summary of downloaded bird citizen science data from eBird, Observation.org and GBIF alongside bird inventory completeness of 10 × 10 km cells sampled across the Iberian Peninsula.

	Dataset
Records	23,372,637
Time interval	1817-2021
Observed bird richness	553
Mean C	0.68
C quartiles (25–75%)	0.97–0.78
Sampled 10 × 10 km cells	6185
Well-sampled cells (lax criterion: N ≥ 200, C ≥ 0.8)	4418 (71.2%)
Well-sampled cells (strict criterion: N ≥ 1000, C ≥ 0.9)	2411 (38.8%)