What environmental parameter dictates the seasonal color change to the white ermine coat observed in weasels inhabiting northern ranges?
Answer
The length of the day
The dramatic seasonal molt where weasels turn completely white is an adaptation known as the ermine coat, essential for camouflage in snowy terrains. Contrary to what might be intuitively assumed, this physiological shift is not triggered by external temperature readings. Instead, the timing of the molt is governed by photoperiodism—specifically, the decreasing or increasing length of daylight hours. This consistent light-based signal ensures the color change occurs reliably at the appropriate time of year, regardless of regional microclimate variations.
Related Questions
What group of mammals shares the Mustelidae family designation with weasels, ferrets, badgers, wolverines, and otters?The genus name *Mustela* for weasels is derived from which two specific Latin words describing its hunting style?Due to an internal furnace characterized by a remarkably high metabolism, what percentage range of its body weight must a weasel consume daily?During its precise and brutal hunting technique, what specific body location does the weasel typically target with its killing bite?Which specific species of weasel found in North America holds the distinction of being recognized as the smallest carnivore globally?What environmental parameter dictates the seasonal color change to the white ermine coat observed in weasels inhabiting northern ranges?In contrast to ancient European views, how did various Algonquian-speaking peoples feature the weasel prominently in their legends?What descriptive action characterizes the intense, high-energy display known as the 'weasel war dance' when prey is cornered?What specialized reproductive process causes the gestation period for species like the long-tailed weasel to potentially exceed nine months in total?If a weasel is cornered, what defensive chemical similarity does it share with skunks regarding its means of repelling danger?What physical feat related to tight spaces allows weasels, whose flexibility is perfect for hunting, to enter areas that seem inaccessible?