A liquid nectar hummingbird feeder has a reusable base with a feeding basin that receives a disposable cartridge containing a pre-filled volume of liquid nectar.

所述液体花蜜蜂鸟喂食器具有可再次使用的底座与喂食盆，该喂食盆容纳包含预先填充的体积的液体花蜜的可丢弃的盒。

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But Professor Temeles said that competition between hummingbirds and other nectar-feeding birds might also have been a factor.

BBC: NEWS | Science/Nature | Oldest hummingbird fossils found