Check out this cool story about how Parrot's technology is being used to protect forests http://www.digitaltrends.com/cool-tech/parrot-drones-sequoia-trees/
5 January 2017 12:33am
Please note that they main use is Parrot sequoia multi spectral sensor, and not specifically Parrot drones.
I think they mainly use 3DR Solo drone for make the mapping of the sequoia.

Thomas Starnes
@Thomas_Starnes
International Union for the Conservation of Nature (IUCN)
Key Biodiversity Areas Programme Officer, IUCN
5 January 2017 10:05am
Thanks for the link, @jprobert ! Parrot Education Blog's own link also here for reference http://edu.parrot.com/blog/2016/12/06/parrot-pix4d-team-forest-canopy-biologists-study-giant-sequoias/
Lot Amorós
Aeracoop
Dronecoria