Earth-Mounds In Australia May The Results Of Mound-Building Birds

The origin of large earth-mounds in New South Wales is hard to explain with geological forces alone, maybe a still unknown species of mound-building bird made them some 10,000 years ago.

from Forbes Real Time https://www.forbes.com/sites/davidbressan/2018/05/20/earth-mounds-in-australia-may-the-results-of-mound-building-birds/
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