Visser says the birds base the laying date at De Hoge Veluwe on early spring temperatures, which, in contrast to late spring temperatures, have not changed in the past 30 years.

• 维瑟说，侯格维陆威的鸟儿根据初春温度来产卵，而相对于晚春的温度，初春温度在过去30年间并没有改变。