On the 26-th of September after just 7 days of travelling I recieved this register cover from Poland. It shows the mammals of the Baltic Sea. You can lear more here:
Mammals of the Baltic Sea
All the animals inhabiting the Baltic Sea are under protection. These are three species of seals and the porpoise - the only Baltic cetacean. Until the beginning of the 20 th century the sea was abundant in these animals, yet since they feed chiefly on fish they were found harmful. There were awards granted to those who killed them. It soon led to almost total extermination of the Baltic seals and cetaceans. The attempts at restoring the population of those animals have been taking place for nearly 20 years. Presently, the main threat they may face is the fishing net they may entangle in. Once entangled, the animals suffocate as they fail to resurface for oxygen. Another threat is posed by environmental pollution which brings on diseases and problems related to reproduction. A third, very important factor, is the development of tourism and fishery. Lack of peace as well as noise scare the animals away from their habitat giving them with no chance to rest, which usually leads to exhaustion. This is the reason why it is forbidden to interfere with a resting seal. However, it is worth informing the Marine Mammal Centre about such encounter.
The Seal Centre of the Hel Marine Station - it is a field station of the Marine Station belonging to the Institute of Oceanography at the University of Gdańsk. The main aim of the station is to restore a colony of the grey seal in the region of the southern Baltic Sea. Those seals, which require care or have been bred in the Centre, return to their natural environment remaining valuable source of information about the species, its migrations or health condition. The Centre performs also educational work and popularizes the mammals living in the Baltic Sea.
New stamps and First Day Cover (FDC)
For the summer time, when plenty of fellow countrymen loosen up at the sea or just recall the stroll on the sands, Poczta Polska prepared a set of stamps presenting inhabitants of the Baltic Sea, the inhabitants whose existence is often forgotten or not known of. Four stamps in the scenery of a sea shore show: a porpoise, a grey seal, a harbour seal and a ringed seal.
The stamps are accompanied by the First Day Cover and an occasional date stamp in use in Hel 1 Post Office. Inauguration of the stamps was held in the Hel Marine Mammals Centre.
Thank you, Andrzej!