The Washington PostDemocracy Dies in Darkness

Drones just captured the most detailed photos of wild killer whales yet

An adult female Southern Resident killer whale nurses her calf. (NOAA Fisheries, Vancouver Aquarium)

Just below the water's surface, a 20-year-old Southern Resident killer whale nursed her baby calf — as a drone hovered 90 feet above.

The stunningly clear photo taken by the unmanned aerial vehicle is the clearest image of a wild killer whale nursing ever captured, National Oceanic and Atmospheric Administration researchers announced last week.

[Why whales need snot-collecting robots]

"[In] previous attempts to photograph from the air, we’ve been in manned aircraft, like helicopters, so we’ve been a lot higher," NOAA Fisheries marine mammal biologist John Durban said on a NOAA podcast released last week. "This is the first time we’ve seen this kind of behavior in this kind of clarity."

Researchers with NOAA and the Vancouver Aquarium spent weeks in 2015 using drones to monitor the endangered Southern Resident killer whales, which live part of the year in the waters north of Seattle.

[Chimp that attacked a drone with a stick planned ahead, researchers say]

With only 81 such whales living in the wild, researchers are intently focused on tracking whether these creatures are growing properly and getting enough to eat, particularly since several stocks of their primary food, Chinook salmon, are also endangered.

But you can't get very close in a helicopter. And measuring wild whales is no easy task. Hence, the drones.

"What we’re trying to do with the hexacopter [drone] is simply to get a camera above the whales and measure their length, so we can monitor growth, and to look at their width profile so we can see how fat they are," Durban said. "We do that by taking pictures and taking measurements from the pictures."

[Gulls have a habit of flaying whales alive, but the whales are fighting back]

In the process, the drone came back with photos of family members bringing salmon to a nursing mother whale; parents keeping watchful eyes on their offspring; and adults swimming alongside their mothers.

Drones have been used in other wildlife conservation efforts, such as assessing the health of humpback whales off the coast of Cape Cod or even thwarting rhinoceros poachers in Africa. Proponents say drones are less intrusive and expensive than helicopters and are effective additions to the arsenal of conservation work. Some critics say little research has been done on exactly how such monitoring impacts the animals below.

In the NOAA research, the drones never flew closer than 90 feet away from the water's surface.

The subsequent images are more than just beautiful; researchers say continued monitoring with drones will track the whales' eating, growth and reproductive habits, telling humans whether they need to step in to help bolster the endangered population.

"By doing that we can help to guide management actions to perhaps help enable these whales in lean times to make sure they get an adequate food supply," Durban said.

Read more about whales:

Long-forgotten secrets of whale sex revealed

Can menopausal killer whales have it all?

Scientists are puzzling out the mass death of endangered whales in Chile

This giant whale evolved nerves that stretch like bungee cords

Why whales need snot-collecting robots