Show by subject Breeding display Breeding behaviour in birds, reptiles and amphibians. Impressions of nature II Sexual dimorphism II Examples of differences in the appearance of males and females of the same species of arthropods, birds and mammals (compare on successive photos). Vertebrates Diversity of forms in vertebrates. Camouflage Examples of camouflage amongs animals. Old age Accumulation of body damages in animals throughout their lifespan. Recently added Periodic plumage changes in birds Individual variability