White-Headed Ducks: Spain's Conservation Success, Global Decline

White-headed ducks, known for their bright blue bills and elaborate courtship displays, are a conservation paradox. In Spain, a dramatic recovery from just 22 birds in the late 1970s to about 2,500 today is celebrated, but globally the species remains endangered. The article highlights the ducks' unique behaviors, including their whisk-broom tails and bubble-trail displays, as described by waterfowl expert Nicky Petkov. The Spanish recovery was driven by wetland restoration, water management, and hunting bans. However, threats persist: habitat loss, pollution, climate change, and hybridization with invasive ruddy ducks, which escaped from a British wildlife reserve and reached Spain in the 1980s. A cull in Western Europe has controlled hybridization, but the risk remains. A new multinational initiative launched in fall 2026 in southeastern Europe, the eastern Mediterranean, and Central Asia aims to expand conservation efforts. Petkov cautions that the success story is not finished. The article also notes that female ducks prefer males with brighter blue bills, a color caused by hormonal changes in the bill's keratin layer during mating season.