How do eggs breathe?

Bird's eggs contain everything that the chick needs, except oxygen. So how exactly does the egg 'breathe'? First, the shell needs to be permeable to gases. The shell consists of a calcium carbonate outer layer, with two shell membranes beneath. A typical outer shell of a hen's egg holds about 10,000 pores, each less than … Continue reading How do eggs breathe?

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Taking a walk on the wild side

One of the things I want to do with this blog is to present a few basic animal physiology topics, in random order. The official reason is that I believe it is important as a scientist to look outside one's niche every once in a while. The unofficial reason is that taking a step out … Continue reading Taking a walk on the wild side