III. Results of multiple-choice experiments:

1. Skirrl, _Pithecus irus_
2. Sobke, _Pithecus rhesus_
3. Julius, _Pongo pygmaeus_

IV. Results of supplementary tests of ideational behavior:

1. Julius, _Pongo pygmaeus_:
Box stacking experiment
Box and pole experiment
Draw-in experiment
Lock and key test
2. Skirrl, _Pithecus irus_:
Box stacking experiment
Box and pole experiment
Draw-in experiment
Hammer and nail test
Other activities
3. Sobke, _Pithecus rhesus_:
Box stacking experiment
Draw-in experiment
Box and pole experiment
Other activities

V. Miscellaneous observations:

1. Right- and left-handedness
2. Instinct and emotion:
Maternal instinct