THE LIFE OF MAMMALS 
size the mother removes it from the “pouch,” but takes it in 
from time to time to suckle it. At night it is necessary for her 
to ramble in search of her own subsistence, and in order to leave 
her child safe during these absences she digs a small burrow 
wherever she happens to be and hides the little one within it. 
BRAIN OF Echidna aculeata, DORSAL VIEW. (NATURAL SIZE.) 
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