behaviour

Sure there is a large biological component to behavior, but it also isn't that simple.Behavior evolves in both the individual and in a population. Some things, such as what you see in the field dogs, may well be simply biological, but there is also a learned component. Lots simply doesn't get passed on.While the basic capabilities to learn language may be genetic, learning a language is not.While it appears, the basic capability to manipulate numbers may be genetic, math and algebra are learned.While the basic capabilities needed to walk upright may be genetic, learning to balance on one foot, to hop, eventually to skip, are learned.The answer when it comes to behavior is likely that both nature and nurture play their part.

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Aslan is not a Tame Lion

Birds migrations, like your swallows, may not be a good example. Since they are a communal species with a fairly long lifespan (more than one migrations cycle) it could be either instinct or learned behavior.But do some research on the Monarch Butterfly. That is almost certainly instinctual.

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Aslan is not a Tame Lion