The earliest data of this kind are from Charles Adams' work (maximum numbers observed) and from Miller and Stebbins (1964) who reported the species as "surprisingly scarce" at JTNP compared to their widespread occurrence in the desert and near cliffs in the southwest.
Only one portion of one of the routes occurred within JTNP, but three were located in its vicinity.
On the eight transects located in or near JTNP, only one raven was observed.
North American Breeding Bird Survey (BBS), and a program coordinated by JTNP called Adopt-a-Raven Transects.
Counts were made at roughly 0.8 km intervals on five different routes in JTNP and one adjacent to it, ranging from twice to 35 times each.
The results of a relatively recent survey of undeveloped areas of the park supports the idea that raven densities in roadless regions in JTNP are much lower than in areas containing roads.
National Audubon Society Christmas Bird Count (CBC) data have been collected at Joshua Tree National Park once each winter since 1969 and at a second site immediately west of JTNP (Morongo Valley) since 1981.
Patten recorded birds between 1987 and 1999 at five areas near JTNP: Morongo Valley, Twentynine Palms, Iron Mountain (approximately 12.9 km northeast of the northeast border of the park), Cactus City (12.9 km west of the park's south entrance), and Desert Center (Fig.
None of the data sets we obtained was a comprehensive assessment of Common Raven distribution or density in JTNP for any time period.
Ravens have been documented in JTNP for more than 50 years.
The first documented observation of ravens in JTNP was in 1935 (Carter 1937), later supplemented extensively by observations from Charles Adams in the mid-1950s.
JTNP consists of two types of desert: Mojave and Colorado.