Assertion: pigeon's bird | /r/CapableOf | see magnetic fields
Facets:
value: to help
type: PURPOSE
Source sentences:
text: Birds move their head to detect the orientation of the magnetic field, and studies on the neural pathways have suggested that birds may be able to "see" the magnetic fields.
text: A prominent theory is that the birds are able to detect a magnetic field to help them find their way home.