Tern ID's

[Evan Beaver <>]

I've just come back from a couple of days fishing on Yakaba Head, Hawks
Nest, about 200k's north of Sydney. The fishing and birding were both
moderate at best. A few Sea Eagles being the main attraction, and a
little penguin visited a few times. 
My main question is, how does one differentiate an Arctic from a Common
tern in the field (I poured a cup of tea on my keyboard and none of the
punctuation is working). All the birds we saw had red beaks, but were
otherwise too far away to tell accurately. 

-- 
Evan Beaver
Lapstone, Blue Mountains