“The frog of course could not understand the desana, but his state of the mind (due the soothing voice of the Buddha) enabled him to grasp a deva bhava, based on a strong past good kamma.”
With respect to the monkey, I have read the following story (I will have to search for it):
A monkey offered honey to the Buddha.
The Buddha accepted the honey, and the monkey was overcome with joy, fell into a well and died.
The monkey was reborn a human and attained arahanthood.