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Movie S1 from Waterbird solves the string-pull test
mediaposted on 19.11.2021, 06:14 by Jessika Lamarre, David R. Wilson
Movie S1. Examples of ring-billed gulls not solving the string-pull test. We considered that the birds attempted to reach the food reward because they continued to interact with the testing apparatus beyond consuming the easily accessible sausage placed at the slit of the box. The last example in the sequence shows the typical behaviours of gulls that did not attempt to solve the test; they simply ignored the box after eating the easily accessible sausage. The gulls presented here were nesting at Long Pond (LP), Spaniard's Bay (SB), or Old Perlican (OP).