SyNOPSIS OF ORDERS AND FAMILIES. 
. “Se 
COMMON TERN. 
Ss 
Family 5. GULLS AND TERNS. LARIDA. ‘ 
Toes usually four, three front ones webbed; upper mandible curved and hooked; tail 
usually square (Gulls, subfamily Larine). Bill straight and pointed; tail often forked 
(Terns, subfamily Sternine ). ; 
Yao Z 
< ee 
aS 
\ RAN —= : = 
EX Lae 
Ss = Ue Se eee aN 
BLACK SKIMMER. NS 
alalt 
