The egg-laying and incubation periods of rockhopper, macaroni and gentoo penguins. Home> Scientific research> Publications> Other> The egg-laying and incubation periods of rockhopper, macaroni and gentoo penguins. Summary Authors:Gwynn A.M. Published in: 1953 Category 3: Article Program area: none Gwynn A.M. (1953) The egg-laying and incubation periods of rockhopper, macaroni and gentoo penguins, ANARE Reports 16. This content was last updated 8 months ago on 20 February 2026.