You can see the chick's beak moving inside the egg ... Get top local stories in San Diego delivered to you every morning. Sign up for NBC San Diego's News Headlines newsletter.

Under these drastically changing conditions, the struggle to survive favored the larger birds with deep, strong beaks for opening the hard seeds. Smaller finches with less-powerful beaks perished.

The Feeder 2 was designed to eliminate such barriers and allow bird enthusiasts to simultaneously enjoy the close-up view of many species and the utility of bird beaks.

“normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile bill-tip organ (a tinamou, close relative of ostriches and emus and which has an ancestral bill-tip organ ...

In the avian world, birds showcase an incredible diversity of beaks—some enormous, others unusually long, and some even lethal. All hornbill species have a unique structure called a casque on ...