The problem was that while they were well documented at some sites, usually the ones with the very nice animals, there was also a large number of them where it was very vague -- there wasn't a lot of description or detail.
Но была проблема: хотя в ряде мест их подробно задокументировали, чаще всего символы,  изображающие животных, в подавляющем большинстве мест не было чётких записей — практически никакого описания или деталей.