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Bright moonlight discourages the movements of many strictly nocturnal serpents. Metaphorically, a full moon is like a person standing outside their burrow pointing a flashlight at them. Bright moonlight makes snakes more vulnerable to human capture and other predators. Coyotes (Canis latrans) and owls enhance their vision using moonlight, improving hunting success, whereas snakes travel efficiently without light using chemosensory and for more specialized serpents by heat-sensing pit organs. Reptiles active in clear moonlight expose themselves to the unnecessary risk of predation.

 

Full moons have also brought people "luck," but luck is subjective. If a person wants Western Banded Geckos

Geckos (Coleonyx variegatus), which span all moon phases, or California Rosy Boa (Lichanura orcutti), rattlesnakes (Crotalus spp.), or other occasionally diurnal or crepuscular species, the moon phase does not really matter. Those species will be active, yet in fewer numbers. Nocturnal snakes, like California Lyre (Trimorphodon lyrophanes) and Desert Night snakes (Hypsiglena chlorophaea), will be out too, but mostly in the shadow of ridges, before moonrise, or when the moon is obscured by clouds. A bright moon can also work in a person's favor, it helps to narrow down which slope to explore at night. Some biologists have learned to avoid those exposed to the glow, spending more time in the shadows. One lengthy study in June 2003 involved driving remote paved roads through Inyo and San Bernardino counties from sundown to sunup during a full moon, with only a banded gecko for the effort. With such poor results, it is not surprising that some herpetologists have developed a loathing for the full moon. This brief post does not address the importance of humidity or air pressure, they also contribute to the levels of success.

 

*Since the moon cycles are ever-changing, the below moon chart is not included in the book.

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Moon Phases
when it matters!
April 2023
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Full Moon
April 6

Last Quarter
April 13

New Moon
April 20

First Quarter
April 27

June 2023
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Full Moon
June 4

Last Quarter
June 10

New Moon
June 18

First Quarter
June 26

September 2023
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Last Quarter
Sept. 6

New Moon
Sept. 15

First Quarter
Sept. 22

Full Moon
Sept. 29

May 2023
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Full Moon
May 5

Last Quarter
May 12

New Moon
May 19

First Quarter
May 27

July–August
In California deserts, these months are usually too hot and dry to be productive
October 2023
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Last Quarter
Oct. 6

New Moon
Oct. 14

First Quarter
Oct. 22

Full Moon
Oct. 28

Official Publisher Website

Amphibians and reptiles

of California

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