Cave art as much as 14,500 years old has been pronounced "the most spectacular and impressive" ever discovered on the Iberian peninsula.
About 50 etchings were found in the Basque town of Lekeitio. They include horses, bison, goats and - in a radical departure from previously discovered Palaeolithic art in the Biscay province - two lions.
Some depictions are also much bigger than those found previously - with one horse about 150cm (4ft 11in) long.
"It is a wonder, a treasure of humanity,"