Don't let their Hitchcockian manner scare you, grackles are just
here to roost  A flock of birds searches for a place to roost
for the night along North Navarro Street near the Victoria Mall.
Black-winged figures cross the sky as the sun begins to set over
Victoria, signifying the end of another Texas October day.  Near
the Victoria Mall the birds, most of them boat-tailed or great-
tailed grackles, flock to the area until the power lines along
the street are crowded with the chirping creatures silhouetted
against the sun.  As traffic continues to rumble down North
Navarro Street the noise of the cars is almost drowned out by
calls from the densely populated highway above it.  Victoria is
on the edge of the largest migratory path, called the Central
Flyway in the United States. Amanda Rocha, executive director of
the Texas Zoo, described the flyways as "super highways in the
sky."  The Central Flyway, one of four flyways in the country,
runs from Alaska to Central America, bringing more than 400
species of mi