In pictures: Underground children

There are fewer girls but they are there. Hana, a 15 year-old, comes from Ziway, a town south of Addis.

She left home and came to Addis after an incident in which she accidentally lost her family's cattle and feared her father’s rage. She hopes to return one day.

"Here you don't have much to worry about," she said.

"If you get something to eat, that is good. When you don't have any, you pass the time either sleeping or chatting with friends."