Frog balancing on logs is not realistic.

[Daniel Bell]

In prototype if over half of the frog was not on the log, the frog would not be considered to be on the log and fall into water, and thus die.

Currently, if even 1 pixel of the frog image is touching the log the frog is considered safe, this should be changed so that:
 * either all the frog needs to be on the log.
 * at least half of the frog is required to be on the log. (preferred approach).

[Daniel Bell (danielbell)]

Fixed this in revision 47.

Frog must now have at least half of the body on the log (around half, because of white spaces and so on) to remain balanced and not fall into the water.