Stellar progress on Steller Watch!

A Steller Watch project update


January 18, 2018
Katie Sweeney



Steller Watch has been live for over 270 days since we launched on March 15, 2017 and I must say, it has been an absolute pleasure working with all of you! We are so thankful for each and every one of you who have joined us online to classify images. Your contributions are what make this project such a success and a vital step for figuring out why the endangered Steller sea lion continues to decline in the Aleutian Islands, Alaska.

We have seen a lot during this time! Citizen Scientists have reported seeing killer whales, sperm whale vertebrae washed up on shore, sea lion pups laying on their mother (what I like to call “pup pancakes“), a rogue puffin going for an epic selfie, and of course many many marked sea lions! I hope you have been enjoying the journey and finding these gems sprinkled among the images.

The power of citizen scientists has blown us away! You all have saved us almost 300 hours by eliminating images that don’t have sea lions with readable markings. You have identified the 7% of images that are the highest priority among hundreds and thousands.

Since this project began, we have had almost 8,000 volunteers join us from 70 different countries around the world that completed over 3 MILLION classifications! That is a total of 340,000 images retired, so far. Absolutely amazing!

I have compiled all of the classifications you have completed over the first 170 days of this project to find out just how much you’re help is benefiting Steller sea lions. What we know is your classifications in the Presence or Absence workflow have helped us eliminate 44% of the images that had no sea lions present.

The images from the Presence or Absence workflow that you all classified as “Yes!”, (sea lions were present in the image) were then used in the Presence of Marked Animals workflow. This workflow is very important because your classifications indicate to us which images are most important for us to review to record sightings of marked sea lions. Most importantly, we are looking for the sea lions with readable markings. You can read this blog post to understand what we can learn from these sightings and how they can help us discover why this part of the population continues to decline.


As you all know, finding marked sea lions and reading the markings can be quite tricky! Well, based on how many well you all have been identifying these images, maybe it’s not that tricky, after all—with your help, we know that 61% of these images had no marked sea lions present. That. is. HUGE. Since images with sea lions take more time to examine for readable markings, you have saved us an incredible amount of time. We categorized the remaining 39% of images into three different levels of priority:

  • 1 – Highest priority: there are marked sea lions that are readable
  • 2 – Medium priority: there are marked sea lions that are likely readable
  • 3 – Lowest priority: there are marked sea lions that are not readable


Ultimately, we think that it will only be necessary for us to look through images in priority category 1 and 2, which is about 13% of the images with sea lions present.

The power of citizen scientists has blown us away! You all have saved us almost 300 hours by eliminating images that don’t have sea lions with readable markings. You have identified the 7% of images that are the highest priority among hundreds and thousands.

And this is just the beginning. This is a long-term study and we are committed to following these marked sea lions over their lifetime (up to 30 years!). We will continue to need your help along the way. Currently, we just have 50,351 images to go through in the Presence of Marked Animals workflow and I know, with your help, we can get through these in no time!

current progress.PNG

It’s amazing to see citizen scientists like you, from all over the world, come together to help us on Steller Watch and for me, one of the greatest parts of this project is the Talk forum. I have been able to observe and participate in so many thoughtful conversations and discussions. I have had the pleasure of chatting with many of you answering questions personally and have seen citizen scientists working together to answer each others’ questions. One of my favorite parts of my day are when I get to log-on and communicate with you all. We have some of the greatest citizen scientists on our Steller Watch team! And, if you’re just joining us, don’t be shy! We warmly welcome you to join in on the conversation and ask questions.

From the Steller Watch team, we thank you all for you dedication and contributions in helping us find out why the endangered Steller sea lion continues to decline in the westernmost Aleutian Islands, Alaska. 


I have been a biologist in NOAA Fisheries Alaska Fisheries Science Center studying Steller sea lion population abundance and life history for over 10 years. I am an FAA certified remote pilot and have been flying marine mammal surveys with our hexacopter since 2014. I earned my B.S. in Aquatic and Fishery Sciences at the University of Washington and my Master in Coastal Environmental Management at Duke University. 

January 1st: ~1

Sea Lion of the Month

SLofMHappy New Year! Since we are at the beginning of a brand new year, I thought we could look back to the beginning of this project. The Sea Lion of the Month for January  is ~1, who was the first pup marked back in 2011. This sea lion is a female that was marked on June 23, 2011 at Gillon Point (on Agattu Island). She weighed about 54 pounds (24 kg) and was almost 3.5 feet (103 cm) long.

She has proven to be quite the home-body, staying around Agattu Island. We have spotted her mostly in remote camera images at both Cape Sabak and her birth place, Gillon Point, on Agattu Island. She stuck around Gillon Point until the spring of 2012 and then she must have gone somewhere with her mother by the time summer came around because we didn’t see her in person or in our remote camera images again until the spring of 2013!

Here is an image of ~1 captured on June 17, 2013. She is about two years old in this image and looks quite cozy snuggled up to a mother-pup pair!

From spring of 2013 through 2014,  she stayed mostly at Cape Sabak with some intermittent visits back to Gillon Point. Below you can see an image we took of ~1 during our visit to Gillon Point on June 23, 2015, exactly 4 years after the day we captured her in 2011. She’s was looking great and as you can see has developed some fungal patches. These fungal patches (circle markings) are harmless and usually permanent which can help us identify her in the future!



We saw her again in 2016 but this time with a pup (no picture taken but the sighting was confirmed)! True to form, this female sea lion must have bred when she was 4 and then had her first pup the following summer when she was 5. Though we didn’t see her in 2017, hopefully you all are seeing her in remote camera images and we will see her next summer with another pup!

Curious about other pinnipeds (seals and sea lions)? Check out our neighbors in the Pacific Islands to the south, the monk seals of the Northwest Hawaiian Islands. The Pacific Island Fisheries Science Center features their own Monk Seal of the Month!

We will share the story of one marked sea lion each month. Be sure to check our Sea Lion of the Month page on the 1st of every month to learn about our featured Steller sear lion. You may nominate a sea lion by submitting their full mark on the Sea Lion of the Month nomination forum. Thank you all for your nominations!