Collection of interesting natural things

I took the picture above to see if I could get a good shot of the ocelli - three secondary eyes between the big ones. They are just about visible. Why spanning tree? It's a routing term, from each user's perspective the network looks like a spanning tree - with no loops and only one route to any place. Every user's spanning tree is unique.

Beetle tracks

SciencePosted by Jay Mon, April 16, 2012 20:14:51
Ash Bark Beetle - Leperisinus varius

I guess, although I didn't catch any, I'll have a closer look. In ash log, felled 2 years ago. How do they avoid other tunnels? Side to side as well as end on?