These were made by excavating trenches and then roofing them over with concrete. The nest chamber at the end of the burrow has a removable lid.
Ligzdas kambarim alas galā ir ierīkots noņemams jumts, lai mēs varētu kontrolēt, vai ligzdā ir ola vai putnēns, vai arī neizšķīlusies ola — vanckars.