Yet, migratory species that belong to Anseriformes, Charadriiformes, Pelecaniformes,

Yet, migratory species that belong to Anseriformes, Charadriiformes, Pelecaniformes,
and Procellariiformes and breed in temperate or polar environments have mass-independent basal rates
equal to those found in passerines什么意思 啊

然而，据发现，属于雁形目、鸻形目、鹈形目和鹱形目的迁移物种在温带和极低环境下大量独立繁殖的基本比率与雀形目鸟持平。