Hummingbirds lay the smallest eggs ,the eggs (of bee) Hummingbirds are about 0.2 inches long .Ostrich lay the biggest birds eggs ,they can weigh up to 5.5 pounds .and they are so hard that a human adult can stand on them without breaking them ,not all eggs are white or brown , the thrush ,bullfinch ,starling and blackbird ,are bird species that lay blue eggs .(Emus) ,lay green eggs ,Oyster catchers ,speckled eggs .
All birds are warm-blooded ),there are only two bird species that can reduce their body temperature .one of them is the Hummingbirds ,it always needs its energy but they can’t eat during the night , therefore it’ll reduce their body temperature ,and enters a kind of nighttime torpor, the common (poorwill) also is an exception, it hibernates for several weeks a temperature lower than 15 degrees Fahrenheit
speckled 有斑点的
hibernates 冬眠
torpor 不活泼