Yes, Penguins can have twins as they’re also birds and lay eggs. The occasional or rare egg could be a double yolker in which case the egg can also contain two fertilized twins and are possible just as they are with chickens, but it is highly exceptional.
The emperor and king penguins lay one egg best and hatch them on their ft. below a brood pouch, however, the different 15 species nest at the ground or in burrows and put two or three eggs. Regularly they’ll enhance two chicks effectively.
Penguins and humans share similar ability when it comes to breathing underwater. Like humans, penguins also cannot breathe underwater. Penguins cannot breathe underwater because they do not have gills. When they are in the ocean in search of prey they have to hold their breath. The duration of which they can hold their breath depends on the species.
Penguins have to go airborne to breathe and dive in to continue the hunting. Some penguin’s food may be available in the minimum reach in the ocean but certain species which prey on krill, squid, and fish have to dive deeper into their food.