TY - BOOK AU - Cowcher,Helen TI - Whistling thorn SN - 0590472992 : U1 - E583 12 PY - 1993/// CY - New York PB - Scholastic KW - Acacia KW - sears KW - Ecology KW - Natural history KW - Africa N2 - Explains how the acacia evolved its own protection against browsing animals and helped create a balanced natural environment ER -