She also noticed that the tiny caterpillars—1 to 2 mm long—reside in solitude on birch leaves, making her speculate whether they are warning off intruders with the vibrations they transmit ...

Thanks to them, birch leaf tea: Preparing birch leaf tea is extremely simple. Just: Additional tips: You can add other herbs to birch leaf tea, such as horsetail, nettle, or dandelion Birch-leaf ...