Bluebirds roosting together in a pile using their collective body heat in the cold. They arrange themselves so they don’t smother and alternate positions within the pile. Photo credit Wildlife Rehabilitators of North Carolina.

The original Chick Called Albert has passed away, so our hero managed to hatch a supermarket quail egg and raise it… again.
A new biodegradable seed carrier design inspired by the self-drilling behaviour of Erodium seeds is described in a paper in Nature. The seed carrier has a higher implantation success rate than that of Erodium seeds. This technology may improve the effectiveness of aerial seeding to address agricultural and environmental stresses in degraded regions.
He promises to show us the interior in a later video.
“The Great Stalacpipe Organ” is the largest musical instrument in the world, built into Virginia’s Luray Caverns.