Category Archives: Personal Seal Sheets


We know Thesi since December 2008 when she had her first pup at Helgoland. She is one of those mother animals, that like to go for a swim now and then, leaving their pups back at the beach for a short time. after a bath most times, the animalse get covered in sand, which makes identification via Photo-ID impossible. Thus we assume, Thesi has already had more than the three pups we certainly know about, but was just not identified.

Name: Thesi
ID: 327
Sex: female
First record: 18.12.2008
Last record: 08.12.2011



Even though Horst might not be identified via Photo-ID because of his uniform fur pattern, you can easily recognize him because of his immense scar across his belly. Where exactly he got this scar from is unknown.
Eyewittnesses however reported him dragging himself on to the beach heavily bleeding. Noone was sure he would have a chance to survive. He was already quite enfeebled. Like many other injured animals (i.e. harbour seals with big skin lesions) it is supposed, that Horst intentionally came to Helgoland to find cure. The cause is an algae named Laminaria saccharina which is the strongest iodine collecting algae in the plant kingdom. The animals use this algae to support the healing of wounds. The “Düne” is used as a sanatorium.

Gladly somehow he managed to survive this major trauma. Now he visits the “Düne” mostly during winter, where he prefers the Aade beach.

Name: Horst
ID:  836
Sex: male
First record:
Last record:
Miscancellous:  immense scar across belly



Archibald can be found at the “Düne” during moult, most likely in May, but also in winter to find a mate. A scar on his left shoulder makes it easy to identify him. Unlikely most other males you can also identify him by his fur pattern. He has got several white spots around his neck. Most profoundly, a big white line right across the underside of the neck.

Name: Archibald
ID: 485
Sex: male
First report:
Last report: 06.01.2013
Miscancellous:  scar left shoulder


Kat was first spotted in winter 2016 by the Ranger of the Düne. Now she had her second pup at Helgoland. In the following years, we will keep an eye on her, if we will also see her in spring during moult.

Name: Kat
Sex: female
First report:
Last report:
Miscancellous:  marginal scar around the neck