1.   Alpacas shriek when danger -- such as a wolf -- approaches.

2.   Fire danger is approaching critical levels, he said.

3.   If danger approached, the awkward-flying young had thickets of mountain laurel and a spattering of hemlocks in which to hide.

4.   Often, one bird will act as a sentinel for the others, perched on a treetop and calling vociferously when danger approaches.

5.   What they do is hide the young in their mouths when danger approaches.