Unraveling Traveling

@article{Kyriacou2009UnravelingT,
  title={Unraveling Traveling},
  author={Charalambos P. Kyriacou},
  journal={Science},
  year={2009},
  volume={325},
  pages={1629 - 1630}
}
The monarch butterfly uses a time-compensated clock in its antennae to calculate seasonal migration routes relative to the Sun's position. There are few more awesome sights in the animal world than the seasonal mass migrations of the monarch butterfly, Danaus plexippus, from the northern United States and southern Canada to its overwintering grounds in central Mexico (1). As with other insect orientations, the monarch uses the position of the Sun to calculate where it should be going. However… 

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Antennal Circadian Clocks Coordinate Sun Compass Orientation in Migratory Monarch Butterflies
TLDR
It is shown that the antennae are necessary for proper time-compensated Sun Compass orientation in migratory monarch butterflies, that antennal clocks exist in monarchs, and that they likely provide the primary timing mechanism for Sun compass orientation.
Illuminating the Circadian Clock in Monarch Butterfly Migration
TLDR
It is reported that constant light, which disrupts circadian clock function at both the behavioral and molecular levels in monarchs, also disrupts the time-compensated component of flight navigation and shown that ultraviolet light is important for flight navigation but is not required for photic entrainment of circadian rhythms.
Defining behavioral and molecular differences between summer and migratory monarch butterflies
TLDR
It is shown that increasing juvenile hormone activity to induce summer-like reproductive development in fall migrants does not alter directional flight behavior or its time-compensated orientation, as monitored in a flight simulator, and thus shows that seasonal changes in genomic function help define the migratory state.
Cryptochromes Define a Novel Circadian Clock Mechanism in Monarch Butterflies That May Underlie Sun Compass Navigation
TLDR
The results define a novel, CRY-centric clock mechanism in the monarch in which CRY1 likely functions as a blue-light photoreceptor for entrainment, whereas CRY2 functions within the clockwork as the transcriptional repressor of a negative transcriptional feedback loop.
Cryptochrome is present in the compound eyes and a subset of Drosophila's clock neurons
TLDR
It is shown here that CRY is expressed in specific subsets of Drosophila's pacemaker neurons and in the photoreceptor cells of the compound eyes.
Cryptochrome Mediates Light-Dependent Magnetosensitivity of Drosophila's Circadian Clock
TLDR
It is concluded that Drosophila's circadian clock is sensitive to magnetic fields and that this sensitivity depends on light activation of CRY and on the applied field strength, consistent with the radical pair mechanism.
Cryptochrome mediates light-dependent magnetosensitivity in Drosophila
TLDR
It is shown that the ultraviolet-A/blue-light photoreceptor cryptochrome (Cry) is necessary for light-dependent magnetosensitive responses in Drosophila melanogaster, the first genetic evidence for a Cry-based magnetosensitivity system in any animal.
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