Site C9. This line of outcrops is at the ridge top. There is no 
vegetation, nor is there sufficient ruggedness. 
Site CIO. This site is located at the ridge top but is devoid of other 
suitable characteristics. The area is barren and the cliffs are short 
and smooth. 
Site Cll. The cliffs on this site are very low, but are rugged and well- 
separated. Adequate vegetation is available. THe cliffs face southwest. 
Site C12. These cliffs are located at a low ridge top and face south 
west. Vegetation is adequate nearby but not in the cliffs themselves. 
Access to predators is eased by the long, sloping backslope. The site 
is most similar to areas in the south Ogilvies, but is isolated, like 
an island, from other ranges. 
Sites C13 and C14. These sites are outside of the study area but were 
included because they were used by sheep in the past. The presence or 
absence of lambing activity has not been recorded. The cliffs are small 
in number and low, thus providing poor escape terrain. The slope of 
site C13 is steep and with a southwest aspect. Site C14 faces north and 
is less steep. 
Site C15. These small but rugged cliffs face northwest and are situated 
at the top of a ridge. 
Site C16. This is the only site with no suitable characteristics at all. 
It is too low, there is little vegetation, faces north and is situated 
on a shallow slope. 
Site C17. This site was the only instance where the black and white 
photos led to a different interpretation than the colour photos. The 
colour analysis resulted in a rating that was lower than that resulting 
from black and white analysis. However, the extreme shadow on the 
colour contributed to the difference. Although the site is at low 
altitude, the remainder of the characteristics are suitable. It faces 
southwest and is very steep with plentiful vegetation. 
Central Ogilvie Mountains Summary 
Both colour and black and white photos were available for most of these 
sites and greatly aided the evaluations. Cliff structural detail was 
more easily ascertained in black and white photos because the shadows 
exaggerated the form rather than muddying the colour. One site (C17) 
was evaluated at a higher rating following both analyses. In all others 
the dual analysis clarified the evaluation. 
No sites were determined to be clearly suitable for lambing, and only 
three present enough suitable characteristics to warrant further 
investigation. These were sites C6, C12 and C17. The field investigator 
should begin the examination there. 
CONCLUSION 
It is possible to differentiate between areas suitable and unsuitable 
for lambing. Of 37 possible sites, analysis identified three as prime: 
sites SI, S3 and S10. Two of these, sites SI and S10, have been 
identified previously as productive lambing sites (Stewart 1981). A 
further five sites were evaluated as having some suitability: sites S8, 
S9, C6, C12 and C17. Air photo interpretation is a very valuable tool 
in the initial identification of sites that clearly showed that a group 
of cliffs does not make a lambing area. Specific requirements must be 
met in order for cliffs to be productive as lambing areas. The 
characteristics examined in this paper were the presence of rugged 
broken cliffs, altitude, slope, aspect, vegetation and winter range. 
They interact and produce the required habitat.