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32 EARLY SPRING: 
and then another too short. I find a good 
plan is to have one of the three legs of the 
tripod about six inches longer than the other 
two—and in arranging them to keep the 
long one always in front. After fixing the 
camera the lens can be turned forwards. But 
a balland socket head on which to mount the 
camera 1s very convenient (in fact, indispen- 
sable) for field work. Not only can the 
camera be rotated at will, but it can be tilted 
upwards or downwards or in any direction. 
Near by were the remains of a feast made 
by some creature that certainly could dive, 
for scattered about were many mussel shells— 
some quite fresh and with their hinges intact. 
Now, mussels live 1n mud and in rather 
deep water. Carrion crows are known to feed 
greedily on them, but they are not diving 
birds. So we concluded’ that .ducks’ =r 
perhaps the long-billed herons, were the 
fishermen. Perhaps, too, the artful carrion 
crows let the other birds do the diving, whilst 
they did some of the feasting !--Menaaea 
bleached head that carried a strong sharp 
