There are a few ways to identify Northern cardinal eggs. First, look at their general color. The eggs of these birds come in hues of off-white, such as grayish white or greenish white. Then check ...

The risk is slim that candling might upset their mother, Beauty, and cause her to reject the eggs, which are her first in 13 years at the zoo. But Tobias said why take any chance at all?

The ability to monitor developing avian embryos and their associated vascular system via candling enables the application of important reproductive management techniques. Egg candling facilitates the ...

While birds have a pair of ovaries, the only functional one is on the left side — which in this cardinal is female, so it is theoretically possible that it could lay eggs, Dr. Hooper said.

The birds can be found nesting in thickets of brambles or low saplings year round. Male cardinals are bright red, and females are brown with dull red crests, wings and tails. Cardinal eggs are ...