Get a Grip

Criteria	Primate	Human	Bird
Size	Large	Medium	Small
No. Of Digits	5	5	4
Texture	Leathery	Smooth	Rough
Length of Digits	Long	Medium	Short
Size of Palm	Large	Medium	Small

Different ways of holding different objects with one hand:

Observation and Drawing of how I am holding my pencil case:

The four fingers: pinky, ring, middle and index fingers are together, at the same side of the pencil case.
The thumb is exerting a force opposite the other four fingers.