Was there any particular criterion for the choices of stages there?
All the chick ones are within about a day of each other while the mouse stages cover almost a week.
It looks to me like the chick at 15+ days
The chick numbers aren't days, a day 15+ chick embryo is practically hatched. Hamburger Hamilton stage 15, Hamburger Hamilton (HH) is the standard staging system for chicken development, is about 2-3 days worth of post fertilisation development.
If you took later human (
Carnegie stage 14 maybe) and chick (say HH21) embryos they would also be very similar to the E10.5 mouse embryos.
For anyone really interested in comparative development the full text of the seminal Hamburger and Hamilton paper on chick development is available online as a
PDF as is Karl Theiler's work on the development of the mouse available
here. The only online version of the original Carnegie staging paper,
here, has very poor figure reproduction. You would probably be better with a more modern atlas of human development like the
Multidimensional Human Embryo although for earlier stages the
UNSW pages are better.
TTFN,
WK
Edited by Wounded King, : No reason given.