Videos

These videos are free to use for educational purposes. To download them click on vimeo on the bottom right. To view them full screen click on the symbol next to the HD at the bottom. The bullets can be copied and pasted into a word document.

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  • Beaver Cutting a Cottonwood Log shows a beaver cutting a chunk off of a fallen tree and swimming off with it.
  • Both the cottonwood chunk and a large portion of the fallen tree appeared near their den and winter cache about two days later.
  • What amazed me is the large log was gone the next night. The beavers apparently moved it without cutting any more off of it. 
  • At the end of the video I tried to document where these logs were present two days later. 
  • Groundcone and Bumblebees shows bumblebees coming to the groundcone flowers. They may be the major pollinators of this plant Boschniakia rossica
  • From Sunrise to Sunset is a timelapse video taken with a Browning Strike Force Pro Trail Camera.
  • It was set in the Timelapse mode to take one photo per minute.
  • The time was set for all day -- basically from sunrise to sunset.
  • On November 1 in Juneau, Alaska the camera operated from 7:33 a.m. to 5:34 p.m. (ten hours).
  • It took about 600 photos - each photo at 300 dpi was 12.8 by 7.2 inches. 
  • With a 128 GB card it would last about 220 days
  • Saved as AVI, converted it to MP4 in Video Pad, and produced it in Movie Maker. The original size was 594 MB the production size was 208 MB.
  • Without any changes the video lasted 2.03 minutes. 
  • Beaver Chewed on a Cottonwood Seven Nights before it fell shows a sequence from almost the beginning to the end. It looks like the tree was chewed on for one or two nights before I started filming the tree. And the tree got hung up in other trees. It will be interesting to see if and how the beavers deal with this. Over time the tree will eventually fall in the water. 
  • I have used both the Browning Dark Ops HD PRO and Strike Force PRO XD Trail Cameras to record beavers working on cottonwood trees. 
  • The cameras were set to record video at the maximum length which is 2 minutes with a 1 second time delay set between videos. At night the cameras will run for 20 seconds when triggered. They will focus on a subject as close as three feet away.
  • Very little is known about a beavers behavior when working on these large cottonwood trees. I think these cameras would be an excellent means of documenting their behavior. And it would make an excellent project for a student to work on. These cameras cost about $200 and they do a good job and best of all you can see how to position the camera through their viewing screen. With each video they record the date, time, and duration of the activity.  With only 6 AA batteries they can operate for several weeks. A HME Trail Camera holder works very well for mounting the camera on an adjacent tree. 
  • In general here is what we have learned so far: They worked on the trees only during the hours of darkness mostly between about 8 p.m. and 6 a.m. in October in the Juneau, area. The total time spent chewing ranged from 13 to 18 minutes per night. When chewing they would occasionally stop and eat a strip of the cottonwood bark. It usually took several nights, up to around 9, before the tree would fall. Sometimes the beavers would wait several days before returning to chew on the tree. 
  • Of special interest is in working on about 7 different cottonwood trees we have yet to record the tree falling while the beaver was working on it. This indicates that most of the trees may fall in the wind or just time. Can beavers sense this and know when to leave a tree alone? It certainly would help them avoid getting hurt by a falling tree. 
  • For a good study of this behavior look at /sites/default/files/Beavers%20Masters%20of%20Downfall%20by%20Alexander%20V.%20Badyaev.pdf
  • Trumpeter Swans on Mendenhall Lake is a Timelapse sequence of photos taken by a Browning Strike Force ProXD trail camera. 
  • The camera was set to take photos all day at one photo per minute. 
  • The quality of each photo equals about 12 by 7 inches at 300 dpi.
  • For a camera less than $200 I was impressed by what it can do. It operates on 6 AA batteries often for several weeks. 
  • At the beginning of the video I put one of the photos of the two parent swans with their three youngsters. Later in the video I cropped the one photo to show them closer. 
  • Using this camera in the Timelapse mode allows one to document certain animal behavior during the daytime hours. 
  • Ravens really like Aucuparia berries shows ravens feeding on the berries of European Mountain Ash trees (Sorbus aucuparia) in Juneau, Alaska.
  • The fruit of S. aucuparia were used in the past to lure and catch birds.
  • The binomial name Sorbus aucuparia is composed of the Latin words sorbus for service tree and aucuparia, which derives from the words avis for "bird" and capere for "catching" and describes the use of the fruit of S. aucuparia as bait for fowling.[4]
  • For interesting information about these trees look at https://en.wikipedia.org/wiki/Sorbus_aucuparia
  • Marbled Murrelet Flying Underwater is a short clip of one going in front of a gopro I had underwater in the Juneau area on December 14, 2019.
  • To learn about their diving abilities look at https://www.naturebob.com/how-deep-can-they-dive and read the connected literature under the video.
  • Dolly Varden at sea in winter shows the fish in saltwater in the Juneau area.
  • This may be the first real documentation of these fish at sea in winter.
  • When I studied Dolly Varden in Southeast Alaska at Eva Lake on Baranof Island no Dolly Varden entered the weir towards the lake after mid-December. Also we could not find any in saltwater during winter by seining. 
  • Tagging and fin-clipping indicated that the majority of the Dolly Varden spent the winter in freshwater lakes and some rivers. 
  • This is a project in progress and will be updated as I get more information.
  • For information about Dolly Varden in Alaska look at Dolly Varden charr, Salvelinus malma by Robert H. Armstrong & James E. Morrow

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