The most likely reason for the decline of this frog is predation by two large exotic frog species introduced to the wild, the bullfrog and the green Frog.
(The most likely reason for the decline of this frog; is; predation by two large exotic frog species) (two large exotic frog species; introduced; to the wild)
The most likely reason for the decline of this frog two large exotic frog species
is introduced
predation by two large exotic frog species
to the wild