perhaps
a sudden
flash of movement
as they pace
back and forth
or
a glimpse
of
a head
           a shoulder
                           an arm
as they bend
to their food
it's quite common
to see them
from behind
while their attention
is focused on something
bright
and colourful

it is not always possible
to see the inhabitants
of each enclosure
but
rest assured
they are in there
somewhere

may i suggest returning
at 8 o'clock on Thursday?