The temperature decrease causes some of the dichloromethane vapor in the head to condense.
The lower temperature and condensation together cause the pressure to drop in the head (governed by equations of state).
The higher vapor pressure in the warmer base pushes the liquid up the neck.
As the liquid rises, the bird becomes top heavy and tips over.
When the bird tips over, the bottom end of the neck tube rises above the surface of the liquid in the bottom bulb.
A bubble of warm vapor rises up the tube through this gap, displacing liquid as it goes.
Liquid flows back to the bottom bulb (the toy is designed so that when it has tipped over the neck's tilt allows this). Pressure equalizes between top and bottom bulbs.
The weight of the liquid in the bottom bulb restores the bird to its vertical position.
pragmatic sensualist, motivated by really deep instincts, actualized by willful imaginings and perpetuated by other's desires. Abstract, yet clear in purpose, honest, but abstruse, my moods change like winds and water with my confidences, and when ungrounded, i am both guarded and vulnerable, leaning, in darkness, to the Light, nurtured by instinctual feelings arising from a deep gene pool.
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