Muttonbirding is when people catch and eat birds called muttonbirds. Muttonbirds are also called shearwaters and they live in the ocean, but they come to land to lay their eggs and raise their babies.
When people go muttonbirding, they usually do it at night because that's when the birds come back to the land to rest. People use special lights to attract the birds and then they catch them with nets.
Muttonbirding is a tradition that people in certain parts of the world have been doing for a very long time. For example, in Australia and New Zealand, Indigenous peoples have been muttonbirding for thousands of years.
After catching the muttonbirds, people usually use the meat to eat. Sometimes they smoke the meat to make it last longer. Muttonbirding is an important part of the culture and heritage for many people, but it's also important to make sure it's done in a sustainable way that doesn't harm the bird populations.