Chap. 6 



MUTUAL RELATIONSHIPS OF ANIMALS 



103 



Fig. 6.9. Relations of parents and young. Top left, termite, Hodotennes turke- 

 staniciis, king and queen beginning to dig the burrow that will lead to an elaborate 

 underground nest with thousands of occupants of which they will be the parents 

 (After G. Jacobson). Top right, male water bug, Pelostoma fiiimineum, with de- 

 veloping eggs glued to his back by the female. Such nursery-bearing males can be 

 found commonly in ponds during the summer. Bottom left, Koala, Australian 

 teddy bear. Female first carries the young one in a pouch like that of the kangaroo, 

 then on her back. Adults are about two feet long. Bottom right, male sea horse 

 (Hippocampus) with brood pouch in which the developing young are carried 

 (After Boulenger). (Termites courtesy, Wheeler: Social Life in the Insect World. 

 New York, Harcourt. Brace & Co., 1923. Waterbug courtesy, Morgan: Fieldbook 

 of Ponds and Streams. New York, G. P. Putnam's Sons, 1930. Seahorse courtesy, 

 Rand: The Chordates. Philadelphia, The Blakiston Co., 1950. Koala courtesy, 

 Young: The Life of Vertebrates. Oxford, Clarendon Press, 1950.) 



