Birch tree (Betula sp) with an abnormal growth (or bur) on its trunk. Such growths are often caused by a virus, and they do not always harm the tree. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Jensen, Claus |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Länge: | 18 Sekunden |
Seitenverhältnis: | 16:9 |
Restrictions: | - |