Sea Turtle nesting boxes, New Ireland, Papua New Guinea

Sea Turtle nesting boxes, New Ireland, Papua New Guinea

Great Tit holding an insect in its beak rests on a bird box, England

Bird nest boxes in the Forest of Bowland, Lancashire, England, United Kingdom, Europe

Baby hatch at the children's clinic Kemperhof, Koblenz, Rhineland-Palatinate, Germany, Europe

Boreal Owl or Tengmalm's Owl (Aegolius funereus), looking out of nest cave

Beehive, artificial nesting box for honey bees, Baden-Wuerttemberg, Germany, Europe

Boreal Owl or Tengmalm's Owl (Aegolius funereus), looking out of nest cave

Four young common kestrels (Falco tinnunculus) in nest box, Hesse, Germany, Europe

Little owl (Athene noctua), young bird looking out of the entrance of the nest box, Muensterland, North Rhine-Westphalia, Germany, Europe

Tawny owl (Strix aluco) flies at night with a yellow-necked mouse (Apodemus flavicollis) in its beak to the nesting box, North Rhine-Westphalia, Germany, Europe

Great tit (Parus major), sitting at a feeder, Terfens, Tyrol, Austria, Europe

Bird nesting box on a wooden telephone pole

Reptile incubator, eggs, illustration, zoo, Bristol, England, United Kingdom, Europe

Bird nesting box on a wooden telephone pole

Colourfully painted bird house at the Rosenheim 2010 State Garden Show, Rosenheim, Bavaria, Germany, Europe

Nest box for insects, insect hotel, courtyard, St. Martin Church, Weismain, Upper Franconia, Bavaria, Germany, Europe

Insect nesting box, insect hotel