Beneath my car port 2 Barn Swallows have built a strange, long nest in the middle of one of the metal beams . Maybe a meter long. This area is covered with about 4 cm high of mud bits on the outside of the metal beam. the nest is inside this beam which i - Ask an expert - Wildlife

Beneath my car port 2 Barn Swallows have built a strange, long nest in the middle of one of the metal beams . Maybe a meter long. This area is covered with about 4 cm high of mud bits on the outside of the metal beam. the nest is inside this beam which i