If you look at pictures of Birds in the Air and Cat's Cradle, those are not this block.
Shaded Four Patch matches:
https://tamarinis.typepad.com/tamari...tch-block.html
This site shows how to make it and, at near the bottom of the page, is a link to purchase a "Technique Sheet" for $7 that gives you cutting instructions for blocks in 21 sizes.