PRELIMINARY CLASSIFIED NOTES 177 



fish spawn, but no doubt much is destroyed when the weeds are being pulled up. 

 In Tiree it was observed to feed on Potamogeton pectinatus. Domesticated birds 

 will also eat bread and grain, and Cordeaux states that frogs and water insects are 

 included in their diet. The young are tended carefully by both parents, and subsist 

 on similar food to their parents. [F. c. E. J.] 



6. Song Period. The low courting-notes of this species are only heard early 

 in the year when the birds are pairing. [F. c. R. J.] 



The folloioing species are described in the supplementary chapter on " Rare 

 Birds" :- 



[American trumpeter-swan, Cygnus buccinator, Richardson.] 

 [American whistling-swan, Cygnus columbianus Ord.] 



VOL. IV. 



