Evidently, the frogs, among other critters, are pretty fine-tuned to temperature change.
After a long spell of single digit morning temperatures (that's Fahrenheit!), we had a warmer day today. It didn't freeze last night, and it rained a bit. The Pacific Coast Chorus Frog, among other critters, was apparently sensitive to the change. I parked in the lower parking lot of the FRC campus this morning, and, as I walked up the hill, I was struck by the large numbers of these little frogs chirping. They were all in their mottled brown phase, so they were very difficult to spot. There were also many Juncos and Ravens about, even though I had hardly seen any birds over the past couple of weeks. I didn't see or hear any Bullfrogs, so I assume the ones living in the fish hatchery ponds are still buried in the mud at the bottom, or at least are not so easily tempted to enjoy a brief warm spell.
For comparison, I'm posting a couple of summer photos of the same species of frog showing its green phase. This frog occurs up and down the Pacific Coast and has amazing color variations. Some taxonomists split it into three or more species. The top two photos were taken in my front yard in Quincy and the bottom one was taken behind my previous home in Leggett (Coastal Range).
When I first moved to California it was still known as the Pacific Coast Tree Frog and had the scientific name Hyla regilla. Due to some new genetic testing technology, it was found to be more akin to the East Coast Chorus Frogs and is now, in most manuals, known as the Pacific Coast Chorus Frog and scientifically as Pseudacris regilla. This brief morning episode has given me 'delusions of spring.' I'm sure it won't last.
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