Purposes Signal
Words
are
the
Texts
Types
3
On the river banks of the Nile
River, home to some crocodiles,
there are many kinds of birds,
sometimes called crocodile birds
because they
always
hopping around crocodiles. The
big crocodiles and the birds are
useful to each other for several
reasons. The birds eat flies and
leeches that they find on
crocodiles' skin and mouths. In
this way, the birds get a good
meal and the crododiles get rid
of the leeches and flies.
Sometimes an enemy frightens
the birds who scream and fly
away. As a result of the noise,
the birds give the crocodiles a
warning of danger