56 EDWARD A. WILSON. 
Fig. 5, which presents the head of a normal adult bird, it will be seen that in the latter, 
whereas the feathers of the face and crown are flattened and closely appressed to the 
head, the feathers of the occiput and neck are raised and form a ruff or collar. It is 
hardly necessary to say that this ruff is not peculiar to the isabelline bird ; it occurs also 
constantly in those of normal colouration. With the erection of these feathers is 
associated the wide opening of the eyelids and the exposure of the white sclerotic 
of the eyeballs, giving the bird an appearance which we are apt to associate with 
fright. In the Adélie Penguin, however, the appearance is certainly intended 
rather to induce terror in others, though one may say with truth that any great 
excitement will cause the erection of this crest, with every sign of rage in 
voice and attitude. There is no doubt that the Adélie-Penguin is a quick-tempered 
and withal a very plucky bird, though there are sundry points about its character 
which show a most deplorable lack of the power to draw logical conclusions from 
even the most suggestive facts. In short, however quaint and attractive may 
be its personality, one cannot but consider it to be a bird of very small and unde- 
veloped intelligence. For example, it has no enemies to fear save such as live and 
feed habitually in the water; these are the Sea Leopard and the Killer Whale. 
Its one and only strong idea of danger in the abstract is therefore connected with the 
water, and its power of logical deduction is insutlicient- to grasp the fact that man 
appearing on the surface of an icefloe and knocking over its companions one by one, 
can be avoided by leaving the surface of the ice and entering the water. It 
matters not how many men and dogs may chase it on the icefloe, the more terrified it 
becomes, the more persistently will it shrink from entering the water. Again, one 
would have thought that seeing its enemy, the Skua, ravish eggs and young ones daily 
throughout the nesting season, it would have been a simple logical conclusion to arrive 
at, that the Skuas were better ousted from the rookeries; but instead we find them 
constantly in friendly neighbourhood, their nests often within a few yards of a 
group of penguins’ nests and in the very heart of a rookery of penguins. There seems 
to be in this a deficiency of common sense, since a want of pluck can hardly be 
considered one of the bird’s faults. When confronted by man in the rookery the pair 
will range up one behind the other as close as can be, with ruffles up and every sign of 
an anger which soon breaks into assault and battery. Certainly there are a few birds 
in every rookery easily recognised as cowards at sight, for on approaching them one 
sees the feathers lie flatter along the head and neck instead of rising into the warlike 
ruffle, and in a moment they are off as fast as their legs can carry them; but this is 
not the rule. Hardly a bird but begins to growl and glare with staring eyeballs and 
ruffling feathers as one approaches his sitting mate, and hardly a bird but will without 
hesitation attack the most aggressive biped disturber of its peace. 
The black-throated Adélie Penguin, although its wanderings are limited strictly 
to the icy regions, is a regular migrant within those limits. No one else has had 
quite the opportunity that M. Racovitza of the ‘ Belgica’ had of studying its move- 
