Assertion: tern's prey | /r/HasProperty | concentrated
Facets:
value: such as along the gulf stream boundary
type: LOCATION
Source sentences:
text: Offshore, migrants sometimes feed with other seabirds above foraging tuna, which drive small fish toward the surface, or along strong temperature breaks (thermoclines) where two ocean currents meet, where prey are also concentrated, such as along the Gulf Stream boundary.
text: Typically, only a few Elegant Terns feed near one another, but hundreds may gather when prey are abundant and concentrated.