TWO DAYS WITH THE TERNS 117 
alarm was replaced by a variety of calls, showing 
these birds to be possessed of an unexpectedly ex- 
tended vocabulary. One call was a chirp not unlike 
59. Tern on hillside nest. 
the White-throated Sparrow’s, a second might be 
written tue, twe, twe, and was uttered when one bird 
was in pursuit of another. 
The seaweed not only concealed the camera per- 
fectly, but was so abundant near the bird’s nest that 
the appearance of a fresh mound apparently did not 
even excite the bird’s curiosity, and within twenty 
minutes it had returned to its eggs. It happened, 
however, that the nature of the site chosen induced 
the bird to face the water, and as the camera was 
above, and consequently behind it, the view pre- 
sented did not show it to advantage, but after sev- 
eral unsuccessful trials the attempt to secure a more 
flattering view was abandoned.” 
A bird was now chosen who was incubating two 
eggs placed in a depression in a little mound of sea- 
weed on the beach. On this occasion the camera was 
