800 
POPULAE HISTOEY OP BIEDS. 
he continually rolled his head from side to side^ in a very 
odd manner^ as if the power of distinct vision only lay in 
the anterior and basal part of each eye. This bird is com- 
monly called the Jackass Penguin, from its habit, while on 
shore, of throwing its head backwards, and making a loud 
strange noise, very like the braying of that animal; but, 
while at sea and undisturbed, its note is very deep and 
solemn, and is often heard in the night-time. In diving, its 
little plumeless wings are used as fins ; but on the land, as 
front legs. When crawling (it may be said, on four legs) 
through the tussocks, or on the side of a grassy cliff, it 
moved so very quickly that it might readily have been mis- 
taken for a quadruped. When at sea and fishing, it comes 
to the surface for the purpose of breathing, with such a 
spring, and dives again so instantaneously, that I defy any 
one at first sight to be sure that it is not a fish leaping for 
sport."^^ 
In the last group of the Auk family ( UrincB) the bill is 
covered with feathers as far as the nostrils, and is notched 
in most of the species at the tip ; the hind toe is wanting. 
The name of the group is derived from the typical genus 
Uria^ which contains the Guillemots. Mr. Hewitson"^ de- 
* Eggs of British Birds, vol. ii. p. 400. 
