365Caws is now in its 14th year of publication, and was originally intended to end after 365 days. It has sometimes been difficult for me to find new material, particularly during the winter months, but now as I enter my own twilight years, I cannot guarantee that I will be able to provide daily posts. It is my hope that along the way I may have inspired someone to a greater curiosity about the natural world. If so, I can rest, content in the knowledge that my work here has been done.
Monday, April 6, 2015
Bullfrog Blues
Day 175: As mentioned in an earlier post, the Bullfrogs invading local ponds and creeks can be quite varied in colour, ranging from brown through green, sometimes even aqua blue. The colour of any one frog may change over time as a result of exposure to increasing or decreasing amounts of light, not in response to its surroundings as was once believed. This change is effected in specialized cells and by the manner in which they reflect light. The transition may take weeks or months to occur. The specimen of Rana catesbeiana shown here is entering a blue phase, and if my Bullfrog census for this city park in Yelm is any indicator, the Herons certainly won't be singing the Bullfrog Blues for lack of a hearty dinner.
Labels:
Bullfrog,
Cochrane Park,
colour change,
invasive species,
Rana catesbeiana,
Yelm
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