İğneada Floodplain Forests National Park mixed wood. Vine species are the most distinct plants of the forest. Sprecies of European ash ("Fraxinus excelsior"), oak ("Quercus"), alder ("(Alnus"), beech ("Fagaceae") and maple ("Aceraceae") are trees found in the national park forest. Trout ("Oncorhynchus"), smelt ("Osmeridae"), grey mullet ("Mugilidae") are fish species of the national park. Birds like white-tailed eagle ("Haliaeetus albicilla"), European green woodpecker ("Picus viridis"), owl ("Strigiformes"), grey heron ("Ardea cinerea"), European cuckoo ("Cuculus canorus"), kingfisher ("Coraciiformes"), black stork ("Ciconia nigra)") and hoopoe ("Upupa epops") are observed in the area. Among the mammals are wildcat ("Felis silvestris"), wild boar ("Sus scrofa"), hare ("Lepus"), European pine
The Origin of Birds the reptile." He also finds the eyes of birds and reptiles to be remarkably similar, especially the development of the lens, as well as the ear, which reveals a much wider gap between the Sauropsida and mammals than with birds. He describes the sexual organs of birds and reptiles to likewise be structurally similar, and finds that while most species of male bird have lost the penis to reduce weight, those that retain it bear remarkable similarities to extant reptiles. He writes that secondary sexual characteristics are also similar between birds and reptiles, with both groups frequently utilizing bright colors