egg shell Animals 6 Brood parasitism 6 American robin 4 Aves 4 Egg Shell 4 Egg rejection 4 Nesting Behavior 4 Ovum 4 animal 4 bird 4 decision making 4 eggshell 4 nesting 4 nonhuman 4 ovum 4 3D printing 2 Argentina 2 Article 2 Artificial egg 2 Birds 2 Buenos Aires [Argentina] 2 Cestoda 2 Cestode Infections 2 Chondrichthyes 2 Chroma 2 Color 2 Colour perception 2 Cowbird 2 Decisionmaking 2