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April 20, 2011

African penguin Reproduction: Fertile Eggs


The process of candling eggs is an important part of our African penguin reproductive program at the Academy. It allows the staff to determine fertility early enough to predict hatching and plan for rearing chicks. Candling eggs was reviewed in the penguin 20 October 2010 blog post. Candling eggs requires a steady hand and experience as the embryo is developing important parts of their body every hour in the first few days. While candling we look for blood vessel development inside of the egg. The embryo develops an embryonic lung system that looks like an intricate network of blood vessels which allows the embryo to exchange gases through microscopic pores in the egg shell. The upper third of the egg above shows the characteristic vessels of development at day 9 of incubation.-Pamela Schaller

Filed under: CAS Penguin Colony — Penguins @ 2:38 pm


  1. Very exciting news!!! Can not wait to watch the developement and the hatching of these eggs. What a fantastic time to be watching the penguins.

    Comment by Laura — April 21, 2011 @ 4:33 pm

  2. Right now Jahzara (band on the left) is in the nest (0714, May 22.) Yesterday when I watched it was Agulhas. Whenever I watch there is often another penguin standing at the entrance to the nesting box. Is that the partner? How often do they switch?

    Comment by Lynn — May 22, 2011 @ 7:18 am

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