Can chickens lay eggs upside down?

Chickens lay eggs through a process called oviposition. During oviposition, the egg travels down the hen's oviduct, which is a long tube that connects the ovary to the outside of the body. The oviduct has several different sections, each with its own specialized function. In one section, the egg white is added; in another, the membranes and shell. As the egg travels down the oviduct, it rotates, ensuring that the shell is evenly distributed.

Finally, the egg reaches the end of the oviduct and is laid through the cloaca, which is a common opening for the digestive, urinary, and reproductive tracts. The cloaca is located at the bottom of the hen's body, so the egg is naturally released in a downward direction.

Therefore, it is not possible for chickens to lay eggs upside down.