Hi Sooky
You will find eggs in all the pages of the site and the forum, but open well your eyes because they can be very small ^^
They can be situated wherever in the page, in the text, on the meadow, in the navigation bar on your creatures...
They can appear several times on the same page so don't hesitate to return on few times !
There are no deadlines between the appearance of eggs, they are randomly hidden on the site. You can find there two in a row then nothing more in several pages!
Good luck and be patient