The Euro Bird Portal is a fantastic tool developed by the European Bird Census Council, they have partnered with 81 institutions from 29 different countries to create somewhere where you can see, almost in real time, the movements of a large number of bird species.
They collect around 40 million bird records each year with help from more than 100,000 observers. Which is the largest and most dynamic citizen science biodiversity data flow in Europe. In the portal you can pick either one or two species to compare and see the distribution of reports for each week during the year, you can also use the play button to see the animated distribution map evolve over the whole year. Interestingly you can also choose to show temperature or precipitation in the second map screen and look at how that may affect the bird’s movements.
Go check it out https://www.eurobirdportal.org