Butterflies are common all over the world, but the ones in hot countries are usually bigger and more brightly coloured than those in cooler countries, and there are more ______ kinds.

Some butterflies have a bright pattern of colours on their wings. We can see the patterns only when they fly, but when they ______ on a tree or leaf, they close the wings. On the backs of their wings there are green and brown makings (图案). The markings look like the trees or leaves. They are then difficult to see. The best example of this is the Dead Leaf Butterfly. When its wings are closed, it looks exactly like a dead leaf. There are ______ marks that look like the holes in a dead leaf. When a bird is running after a butterfly, it closes its wings. Then it ______ to have disappeared completely.

Many butterflies have round marks on their wings. The round marks ______ eyes. When they are resting, and their wings are folded, there can’t be seen. When a bird sees one, and begins to come at it, the butterfly opens its wings. The bird thinks that it sees two eyes looking at it, so gets ______ and flies away.