This was a book for littler kids, ages 8 and under, more or less.  This book was read between 1972-1980.  I vaguely remember it being a thin but large paperback.

The main characters were rain-forest animals and the book took place in a rain forest and at least part of it was set at night.  There were peccaries as characters.  Something was happening in the jungle, at night, that the animals were preparing for. The peccaries were really funny characters.