Ключевые слова: bird, can, concept, consequences, contamination, covid 19, dangerous, dirty, disease, ecology, environment, environmental, epidemic, flu, garbage, garbage habits, health care, healthcare, illness, infection, influenza, litter, mask, medical, medical mask, medicine, nature, no littering, pandemic, people, pigeon, pollution, protection, protective, public, respiratory, risk, rubbish, sloppy trash, spread, throw, trash, unsanitary, used, virus, waste, world,