The appearance of thaw holes in the open mark, as the beginning of spring. At the nearest meteorological station take the data on the average daily temperature for March. Construct a timetable for their growth. If meteorological records were made in school circle, they can also be used for this purpose. Note the number where the curve of daily mean temperature rose above zero and became more or less firmly to hold above this level (the beginning of a positive snowmelt). Record the time of arrival the first of rooks. Check the temperature of the air in the afternoon and early morning hours that day, the state of snow cover and sled roads. Exactly where the rooks hold immediately after arrival? Make sure that what they are feeding and how to change their habits by the end of March and mid April. How to change the behavior of those birds that winter, met near the shelter, ie, sparrows, pigeons, jackdaws, crows, titmice, forty, etc.? Celebrate the return of the procedure you are familiar with migratory birds: larks, starlings, finches, gulls, wild ducks, etc.
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