Assertion: blue whale | /r/HasProperty | powerful
Facets:
value: for the 19th century whales
type: OTHER
Source sentences:
text: The blue whale was too swift and powerful for the 19th century whalers to hunt, but with the arrival of harpoon cannons, they became a much sought after species for their large amounts of blubber.
text: The blue whale is a powerful swimmer and feeds mainly on schools of krill, a small shrimplike invertebrate, which it scoops up in large quantities— as much as 2 tons (1.8 metric tons) at one feeding.
text: The blue whale was too swift and powerful for the 19th century whales to hunt but because invention of harpoon cannons, it become easier to catch blue whales.