jäljekäigu

Could you clarify the context for "jäljekäigu"? Is it a real term in Estonian (and if so, which field—linguistics, culture/folklore, biology, etc.)? Or would you like me to create a fictional, wiki-style article about a hypothetical concept named "jäljekäigu"? Providing the intended domain will help me produce an accurate, neutral entry under 300 words.