There Are Pandas, and Then There Are Pandas.
And this isn't either of them! The Pandas we're talking about here, are watches, not bears. And what got me thinking about them (again) was a link posted this morning by @cm.rook who pointed a few of us to the very attractive (and not terribly priced) Yema "Rallygraph" Panda which, in it's most traditional arrangement, looks like the one on the left, but can also be had in the version on the right: The model on the left is a true Panda, while the model on the right is called a reverse Panda. The reason for that distinction is clear--Panda bears, only come in the first arrangement. Now at this point, everyone should be thinking about the most well-know Panda, The Rolex Panda, which is actually a Daytona, and among Rolex Daytonas, the most famous of which is the Paul Newman Daytona, which was famous first, because it was Paul's, and second because it sold at auction for $17.8 million (US Dollars). The story of that auction is well-known so I'll only...
Nov 8, 2019
Enlightened Equipment uses gray duck down for their 850, and gray goose for 900 & 950.
I have never been able to find a factual source stating the superiority of goose over duck for identical fill powers. Obviously the majority of duck down clusters tend to be smaller than goose, so the goose, as a bird, is better than duck (except eiders!). But since producers sort the clusters, you can extract the small % of large clusters and get 800, 850 duck down. Much more affordable than goose down! (See the price jump on EE's site when you go from 850 duck to 900 goose).
http://www.outdoors.org/articles/amc-outdoors/goose-down-vs-duck-down-which-is/
http://www.nemoequipment.com/duck-duck-goose-a-comparison-of-insulations/
https://www.backpacker.com/.amp/gear/the-lowdown-on-goose-down-vs-duck-down
Or maybe a test for sleeping bag manufacturers, before/after EN tests. 'Course, there again you'd be trying to replicate in a lab real world conditions --hah!