1.   Perhaps Clinton will inexplicably start warbling bird calls.

2.   Beluga whales are such expert mimics they can even repeat bird calls.

3.   Bird calls and growlings of howler monkeys off in the forest.

4.   Bird calls and the patter of falling water fill the pink clinic cubicle.

5.   A bird call sounded from the woods.

6.   But many people simply gather on line to tell jokes, try out bird calls, practice a foreign language, play the guitar or talk sports.

7.   Computer-programmed animals like trumpeting elephants and chest-thumping gorillas add to the bird calls and monkey chatter.

8.   Exotica style blended cool jazz with primitive percussion instruments, bird calls and other jungle noises to evoke a steamy tropical mood.

9.   He learned bird calls.

10.   I concentrated on one bird call.