- An early disappearance of snow cover exposes plants to early frosts, which kills buds of the flowers from which butterflies prefer to sip their nectar. Because the amount of nectar available to female butterflies corresponds to the number of eggs they lay, an early spring can mean fewer eggs.
- In the same way that an early frost kills flower buds, it kills caterpillars directly – before they have a chance to form a chrysalis and transform into a butterfly.
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