Parasitic Jaegers are the most regularly sighted jaeger species in the Pribilofs. Although this (and other jaegers) are possible throughout the tour season sightings are generally concentrated into the periods of mid May through late June and late July through late September. Most birds are adults, with the characteristic elongated, and pointed central tail feathers. Jaeger identification can be almost a art rather than a science. Long-tailed Jaegers are gray/brown above, a smaller and slimmer build, more buoyant flight and lack a central breast collar. Pomarine Jaegers are generally larger and bulkier, with a stronger and more direct flight, more white in the upperwing primary shafts and a second pale patch in the underwing at the base of the primaries. Many jaegers are found in flight and at distance and as such should often be left as Pomarine/Parasitic or Parasitic/Long-tailed Jaeger.