Assertion: red footed tortoise | /r/HasProperty | underestimate
Facets:
value: due to the difficulty
type: CAUSE
Source sentences:
text: One study showed a nearly balanced mix of 1.32 males per female, and 1.05 red-footed tortoises per hectare (2.4 acres) on the island, which may be an underestimate due to the difficulty in finding the tortoises.