However , those horses were never registered and little evidence of their existence remains .
Icelandics were exported to Great Britain before the 20th century to work as pit ponies in the coal mines , because of their strength and small size .
Those horses were never registered and little evidence of their existence remains .
Icelandics were exported to Great Britain before the 20th century to work as pit ponies in the coal mines , because of their strength and small size .