acquatic alert animal auritus awake beak beautiful beauty bird birds black cheeky clever cormorant couple dry duck duo environment estuary fatigue feathers flight flock fly flying grass grassy great green group lake large launch little meadow migratory muscle nannopterum natural nature off onocrotalus perch perched phalacrocoracidae phalacrocorax pied pole reflection rhythm river span spread stand straight stump synchronization synchronized take takeoff team tree valentine watch water wet white wing wings