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.
Masalahnya adalah walau simbol itu terdokumentasikan dengan baik di beberapa situs, biasanya yang punya gambar hewan yang indah, masih ada banyak simbol yang masih samar -- tidak ada deskripsi atau rinciannya.