Whoa! Not the main topic of the article, but this is great information!
"Veiled chameleon embryos were previously thought to undergo an extensive period of diapause. However, it is clear that pre-gastrula stage veiled chameleon embryos do grow continuously, albeit at a slow rate for approximately 60 days during which time they gastrulate."
(I needed to look up the definition: according to biologydictionary.net "Gastrulation is the process during embryonic development that changes the embryo from a blastula with a single layer of cells to a gastrula containing multiple layers of cells")
I assume this is the part when the embryo fuses to the side of the egg, after which the egg cannot be turned/moved much for fear of killing the baby:
"In the egg, the developing embryo is initially positioned against the shell, with its ventral side facing the yolk...
By approximately 70dpo, ..., veiled chameleon embryos initiate the process of turning to their right side, starting with the cephalic region. This is the first morphologically apparent evidence for a break in left-right asymmetry. The embryo continues to fully turn to its right side, such that its left side becomes positioned against the yolk" (shortened for clarification).
