ZOOLOGICAL GARDENS. 
83 
than the female, and in these respects it differs from The 
ostrich. The female Emu is the bird endowed with the 
power of making the remarkable noise that is distinctive 
of the genus. The sound is produced far down in a 
membraneous bag connected with an opening in the 
trachea, and if the hand be placed over this region, whilst 
the sound is being emitted, it will be felt to be due to the 
vibrations of the sac. The egg is a beautiful object, being 
of a rich deep green colour, and it is highly prized as a 
household ornament. 
There appears to be another species, a much rarer 
bird, known as the Spotted Emu, and limited to Western 
Australia. 
The Cassowaries are inhabitants of the Papuan region 
and islands, including the northern portion of Australia. 
They are generally distinguished by a casque or bony 
helmet on the skull, prolonged backwards from the beak, 
and covered with a horny epidermis. The skin of the 
neck is usually more or less destitute of feathers, pos¬ 
teriorly and anteriorly, and is generally very brilliantly 
coloured, and, from the anterior surface, in four of 
the species, there are developed two bright yellow 
pendant wattles, and in the case of one species, C. uni - 
appendiculatus of Blyth, there is only one wattle. The 
latter one-wattled species and the Moruk with two wattles 
have been represented in the Gardens. Like the Emus, 
the wings are nearly bare, and the feathers are only repre¬ 
sented by stiff shafts resembling the long spines of a 
porcupine, but wholly black. Their wings assist them in 
running, but they are never used in defence. They, how¬ 
ever, strike with their bills and kick dangerously with 
their legs. The Cassowaries are generally black, but in 
