Can two animals hatch from the same egg?

Yes, in certain species of animals, two animals can hatch from the same egg through a phenomenon known as twinning. Twinning occurs when a single fertilized egg splits into two or more embryos, resulting in the development of two or more individuals. This can happen naturally or be induced artificially through various techniques.

Here are a few examples of animals that can hatch from the same egg:

1. Birds: Twinning has been observed in various bird species, including chickens, ducks, and turkeys. In these cases, the twin embryos develop within the same eggshell, and the chicks hatch simultaneously.

2. Reptiles: Some reptile species, such as certain lizards and snakes, may also experience twinning. The twin embryos share the same egg and develop independently, often hatching simultaneously or within a short time frame.

3. Fish: Twinning is relatively common in some fish species, particularly in certain types of catfish, trout, and salmon. The twin embryos develop within the same egg, and the fry hatch simultaneously.

4. Invertebrates: Twinning has been observed in some invertebrate species, such as certain species of sea urchins and starfish. The twin embryos develop within the same egg, and the larvae hatch simultaneously.

It's important to note that twinning is not as common as single-embryo development and can vary depending on the species and genetic factors. Additionally, the survival rate of twins that hatch from the same egg may be lower compared to single-embryo individuals due to competition for resources within the egg.