npr
smithsonianlibraries:

About a year ago, we posted a gif of hover whales. This, however, was our original creation—at the time too big for Tumblr but now able to be posted.
from Suggestions to the keepers of the U.S. life-saving stations, light-houses, and light-ships; and to other observers, relative to the best means of collecting and preserving specimens of whales and porpoises. By Frederick W. True.

smithsonianlibraries:

About a year ago, we posted a gif of hover whales. This, however, was our original creation—at the time too big for Tumblr but now able to be posted.

from Suggestions to the keepers of the U.S. life-saving stations, light-houses, and light-ships; and to other observers, relative to the best means of collecting and preserving specimens of whales and porpoises. By Frederick W. True.