Off topic, but was given a brief guided tour of the egg collection at Natural History Museum at Tring when we donated my father-in-laws collection a couple of months ago - we were shown the 3 Emperor Penguin eggs collected by Cherry-Garrard and donated - fascinating! Here they are in a presentation by Douglas Russell, curator (who also showed us round).

https://www.youtube.com/watch?v=PdBT670fiCQ