Show by subject Poaceae (True grasses) Diversity of true grasses. Plants Diversity of forms in plants. Colours of the nature: Birds Range of colors in birds. Defensive habits Defensive habits in mammals, birds, reptiles and crustaceans. Portraits II Portraits of vertebrates and insects taken in free nature of South America, North America and Europe. Old age Accumulation of body damages in animals throughout their lifespan. Recently added Periodic plumage changes in birds Individual variability