Lovely images Chris. Great shot of the youngster, love it's big gangly feet. Good exposure of the adult, it retains all the feather detail in the black.
Barry, you can digiscope with a DSLR. This can get you in close without upsetting them too much. Just think an ED80 with a 2x barlow or teleconverter is about a 1.2m lens.
Regards
Keith