This page discusses how to build frog-themed robots.
The “brain” of the frog robots is implemented using a PIC microcontroller from Microchip. The processors I’ve selected are from the PIC16F1777/8/9 family since they seem to be the 8 bit PICs that have the most options for interfacing to analog circuitry.
Aka daughter boards (haha). These boards plug into the PIC brain board using headers.