DUCKS, GEESE, AND SWANS. 197 
Of the remaining five species of Ducks belonging 
to the present sub-family, which are either regular 
visitors to our islands, or residents in them, none 
can fairly be classed as being typically marine in 
their haunts. The well-known Mallard Azas 
boschas, the Teal Aas crecca, and the Shoveller 
Anas clypeata, visit the low-lying coasts, especially 
during severe weather, but they are all eminently 
fresh-water species, and form no dominant feature 
in the bird-life of the coast. Still less familiar to 
the sea-side naturalist are the Gadwall Azas 
strepera, and the Garganey Axas circia. The 
former species is rare in our islands, even during 
winter, whilst the latter is a summer visitor only, 
excessively local, but breeding sparingly in the 
Broads District, where, from the peculiar note of the 
male, it is known as the “Cricket Teal.” We will, 
therefore, pass on to a study of the next sub-family, 
which contains birds eminently marine in their 
habits and economy. 
DIVING DUCKS. 
These birds, described somewhat ambiguously by 
certain authorities as Sea Ducks, for all the species 
are by no means exclusively marine, yet all are 
expert divers, form a fairly well-defined and homo- 
genous group, or sub-family, termed by systematists, 
Fuliguline. They are characterised by having a 
pendant lobe, or membrane, attached to the hind 
toe, and by their anteriorly scutellated tarsi. All 
