蜂鳥(niǎo)發(fā)現(xiàn)花蜜和花粉是很有營(yíng)養(yǎng)的.Hummingbirds have discovered that nectar and pollen are very nutritious.為什么蜂鳥(niǎo)和大猩猩都有脊骨?Why do hummingbirds and gorillas both have backbones?小蜂鳥(niǎo)棲在山楂樹(shù)枝上.The hummingbird perches on a twig of the hawthorn....