R. Clapp 
1964 ’ 
Oct. 11 S i bylla is l a nd , Ta o n gi Atoll 
Four Black nare’d Terns were seen in an onen 
area between -the* southern end of Sibylla and — 
the next islet. They would be very difficult 
to distinguish from Fairy Tern at any great 
distance. The most distinctive identifying 
"mark" is the call which is typically rasping 
"S terna " in nature. 
Of three reef herons seen on this morning f s 
excursion one was white and the other two 
were intermediate "mottled" forms. 
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