Jaeger sp 1

I think this one is a Parasitic. It has a thinner bill, less bulky body, and thinner wings than the other bird. The short pointed streamers also support this. The amount of white on the wings is appropriate too, on 5 primaries. The main negative I see is the straightly barred undertail coverts without any sign of buffieness. It also has a strange blonde head, perhaps showing it is older? Or just molting more quickly?

Done