The Mystery of the Vanishing Creatures(1997)
(A book in the Mysteries in Our National Parks series)
A novel by Alane Ferguson and Gloria Skurzynski
When the animals being raised by members of the school science club start to disappear, replaced by frightening notes, Caitlin begins to suspect Jeremiah Elkins, the newest student in the class.
Used availability for Alane Ferguson's The Mystery of the Vanishing Creatures
April 1997 : USA Library Binding
April 1997 : USA Paperback