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Tuesday, November 5, 2024

Eventide

  

From Bodega Head after sunset on 5 November 2024

Monday, November 4, 2024

In the western sky

  

Crescent moon in the western sky on 4 November 2024.

Sunday, November 3, 2024

Tool chest?

  

We had to do some field work in Monterey County yesterday, but we arrived a little early, so had a few minutes to observe a few sea otters while eating lunch in Pacific Grove.  

The first sea otters we saw were actively munching on sea urchins -- above, and next two photos:



 
 
But then our attention was drawn to a hard slapping sound, and we turned to see an otter trying to crack open a large mussel against a rock that was balanced on the otter's chest:
 
 
Several times we watched this otter dive down, bring up a rock and a mussel (or clump of mussels)...and then use the rock like an anvil -- hammering the mussel against the rock.
 
Sea otters are known to do this, but I hadn't photographed it before, so here are a few more images.  (Tool-use by mammals aside from humans is rare.)  In each picture, look for a rock resting on the otter's chest and a mussel between the otter's paws.
 
 
 
 
 
 
We were reading up on this behavior at the end of the day and came across an interesting research paper about tool use by sea otters just published in May 2024.
 
It turns out that using rocks as tools to access hard-shelled prey might be especially important for female otters in areas where their preferred and easier-to-process prey (e.g., abalone and urchins) aren't as common.  And using the rocks to open hard-shelled prey can prevent tooth damage and give the otters access to an alternative food source that otherwise wouldn't be available by biting alone.

Law et al. 2024. Tool use increases mechanical foraging success and tooth health in southern sea otters (Enhydra lutris nereis).  Science 384: 798-802.
 

Wednesday, October 30, 2024

Glowing from within

  

We hope you've been enjoying the fall season.

 Happy Halloween!

Tuesday, October 29, 2024

Hunter at dusk

  

Well, that's one benefit of working late -- a chance to see Great Horned Owls (Bubo virginianus) on the way home!  

Saturday, October 26, 2024

Moon at sunrise

  

A beautiful sunrise yesterday morning (26 October 2024) with pink highlights in the clouds surrounding the moon.

Thursday, October 24, 2024

Calm seas and...a flash!

  

While watching the sunset tonight (24 October 2024), it felt like good conditions for a green flash.

Sure enough!  Nice green color as the sun disappeared below the horizon.  Here's a tiny bit of it: