Biological Survey Season is here!

Del Sol Group has been busy preparing for surveys for various special status species.  DSG’s Biologists are certified in numerous special-status species, and recently include the Western burrowing-owl (Athene cunicularia hypugaea), Southwestern willow-flycatcher (Empidonax traillii extimus), and Sonoran desert tortoise (Gopherus morafkai).


A summary of the key species and survey times are provided below:



Timing to Start Surveys

Rare Plant Species          


Varies depending on species, habitat, latitude, and elevation, but generally one spring and one summer visit are recommended

Native and nonnative fish surveys all year including; Gila Trout, Apache Trout, Loach minnow, Gila Chub, Roundtail Chub, Desert Pupfish, Loachminnow,  and Gila Topminnow 

April thru September 

Desert Tortoise

April – May or September – October

Riparian Birds/Burrowing Owl    


Southwestern Willow Flycatcher May 15 – 31

Western Yellow-billed Cuckoo June 15 – July 1

Western Burrowing Owl February 15 – April 15

Northern Mexican and Narrow headed gartersnake surveys

May through Sep 

Chiricahua leopard frog

April thru September 

Yuma clapper Rail and Marsh Bird Surveys

March thru May