Photo: Sebastià Torrens. Question marks: Aina Bonner

Challenge 6

As you know, there are reptiles, such as crocodiles, that bury their eggs so they can hatch all by themselves. When the young emerge from the egg, they dig up 20 or 30 centimeters of soil until go outside. Sea turtles do something similar.

Do you know of any birds that do the same? And, if so, which bird(s) do it and where do they live?