This last is actually a little more widespread and was also told to children to have them remember that February has 28, days explaining this with the fact that January borrowed one from February to be able to chill the blackbird.
こちらの最後は実際にはもう少し追加があって、2月が28日なのは、クロウタドリを冷やすために1月が（猛烈に寒い日を）2月から借りてきたからだ、という事を子供向けに説明している。