Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Wadi Al-Hitan (Whale Valley)' has mentioned 'Animal' in the following places:
Occurrence Sentence Text Source
The site reveals evidence for the explanation of one of the greatest mysteries of the evolution of whales: the emergence of the whale as an ocean-going mammal from a previous life as a land-based animal.
The monotony of these sandstones is broken by a white layer full of well-preserved animal burrows (previously thought to be mangrove roots) and a layer of black mudstone above that.