LIFE HISTORIES OP NOETH AMERICAN DIVING BIRDS. 139 



birds, swimming in a straight line, one. ahead of another. They 

 seldom attempted to escape by flying, but preferred to swim away, 

 making very gpod speed with little apparent effort or with very little 

 disturbance of the smooth water; if too hard pressed they dove 

 quickly, one at a time, or occasionally all together; they did not 

 remain under water very long or swim very far away, appearing sud- 

 denly on the surface at no great distance without causing a ripple. 

 The dive is made with a forward semicircular plunge; the bird often 

 leaves the water entirely, sometimes leaping above the surface as 

 much as 6 inches, and plunges down into the water head first, making 

 a clean, smooth dive. While swimming under water it uses its wings 

 freely. Mr. Swarth (1911) noted this habit and recorded his observa- 

 tion as follows: 



On June 7, while we were passing through numerous large flocks, the sea 

 was unusually clear and smooth, and by standing in the bow of the launch, 

 I had frequent opportunity to observe how the murrelets used their wings 

 under the water. When diving they make a sudden flirt of the wings that can 

 be seen at quite a distance, but it was not until several individuals had passed 

 close under the boat that I could see, as was plainly apparent, that they had 

 used their wings continually. They were literally flying under the water, but 

 the manus was held about parallel with the body, and not outstretched, as 

 when going through the air. 



Where these murrelets breed in large numbers they are severely 

 persecuted by the natives who visit the breeding colonies regularly 

 to gather eggs or to kill the birds for food, for both are excellent 

 eating and much in demand. Fortunately much of the region where 

 they breed, particularly in the Aleutian Islands, is uninhabited. The 

 Peale's falcon seems to be one of their worst enemies. Mr. Little- 

 john gives the following interesting account of its hunting methods: 



Great numbers of these birds are taken by Peale's falcon, who seem to be 

 one of their principal enemies next to man. As I have already stated, the 

 murrelets are mainly found at some distance from land during the day, and 

 here, too, this falcon pursues them, watching for a chance to seize any mur- 

 relet he succeeds in driving from the water. After having secured its prey, 

 the falcon circles about for a short time and then partakes of its meal. To 

 do this he hovers, remaining almost stationary for several minutes at the 

 time; in the meantime the prey is raised well up to the beak with both feet, 

 and promptly devoured. When the murrlets return to the land at nightfall, 

 the falcon is there also to meet them, and soon again secures his nightly repast. 



The only note which I have ever heard from this species is a shrill, 

 faint, whistling call note. Mr. Littlejohn describes their call note 

 on the breeding groimds as "a very low but rather shrill whistle," 

 and he says that " while out at sea, the ancient murrelet utters a 

 peculiar piping whistle, entirely different from the one uttered while 

 on the nest." Mr. E. W. Nelson (1887) says "They were in pairs, 

 and not shy. When one was shot the survivor would fly about in 



