Subject	sea otter
Predicate	be considered
Object	keystone species
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.0044
Neighborhood Sigma	0.0044
Local Sigma	0.1679
Example Sentences	Sentence Occurrences Source sea otters are considered a keystone species 2 Google Autocomplete the sea otter is considered a keystone species 2 Google Autocomplete a sea otter is considered a keystone species 3 Google Autocomplete