The most common amphibian in the Tropicalico jungle is a unique variety of tree frog, but this variety is almost never seen, even by trained researchers studying the amphibian. Surprisingly, this frog is seen even less than tinier and less populous amphibian varieties, possibly less than any other amphibian type within the jungle. Each of the following, if true, helps to reconcile the statements above EXCEPT:
A: The tree frog's croak is high-pitched and clearly identifiable while the croaks of most other frogs are low-pitched and indistinguishable.
B: While many varieties of jungle amphibian will frequently move from plant to plant, the tree frog will often stay on the same tree for hours at a time without moving.
C: Most amphibians in the Tropicalico jungle exhibit some sort of communal behavior and often gather around common water sources, but the tree frog takes in water through its skin so it has no need to congregate near a water source.
D: Almost all of the trees within the Tropicalico jungle are covered in vines that bear a remarkable similarity to the patterns on the skin of the tree frog.
Choose A, B, C or D as your solution.
A