- Eurasian Curlew (Numenius arquata): 8.5-12.5 cm (3.3-4.9 inches)
- Long-billed Curlew (Numenius americanus): 11-20 cm (4.3-7.9 inches)
- Whimbrel (Numenius phaeopus): 4.5-6.5 cm (1.8-2.6 inches)
- Lesser Curlew (Numenius minutus): 3-4.5 cm (1.2-1.8 inches)
Please note that these are approximate ranges, and beak lengths can vary among individual birds within the same species.