2-either...or: The animal might learn the task either through repeated exposure or through social observation.

3-neither...nor: Neither the monkey nor the parrot reacted to the change.

4-not only...but also: Octopuses have not only excellent short-term memory but also the ability to navigate mazes with ease.

5-not only... but also (devrik): Not only do crows solve puzzles, but they also plan several steps ahead.

6-whether... or: Scientists continue to debate whether animals truly experience consciousness or simply react instinctively.