B IRD B EHAViOUR The ways animals play with inedible objects may be precursors functional behaviours such as tool use and goal directed object manipulation. For these reasons, species of high technical intelligence are also expected to play intensely with inanimate objects when no obvious goal is pursued. Within object play, combinatory actions are considered a particularly informative trait in animals as well as human infants: Children start bashing two objects together when they are about 8 months old, at 10 months, they combine toys with elements from their environment, such as inserting them into cavities or stacking rings on a pole. Only after their second year, infants start using objects as tools to obtain a desire goal. In animals this has so far mainly been studied in primates. Within this group, complex object combinations during play are largely limited to ...
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