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Piagetian object permanence
in young hooded crows and budgerigars Object permanence was investigated in different bird species but nothing is known about young birds. We studied this ability in 6 hooded crows at the age 60 - 180 days and in 12 budgerigars at the age 30 - 100 days with 4 and 2 tests, respectively. Because the exact age of crows was unknown, we use the time when bird begin to feed by itself as index of sensomotor development. This time was varied from the beginning of June (the approximate age: 30 - 45 days) to the beginning of July (60 - 75). The ability to find food behind opaque screen was observed from the middle of June (40 - 55) to the end of July (80 - 95). We did not reveal any link between the beginning of independent feeding and the ability with opaque screen. Crows were also able to find food under the opaque cylinder, this ability emerged either at the same time as previous test or after it. Therefore the Stage 4 was reached in young crows at the age of 3 months meanwhile only a few budgerigars are capable of finding object behind or under opaque obstacles until the age of 100 days. Keywords: cognition, birds, object permanence, crows, budgerigars |
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