This is another video from Ireland. It says about itself:
2 August 2016
[Grey] Herons are predatory birds that like to catch and eat rats throughout the day and night when they are hungry, this is amazing feeding behaviour from these birds. Herons hunt and catch and eat rats and other small rodents throughout the day and night as part of the heron’s daily diet. A heron will look closely at the foliage that rats like to forage in and when it spots their movements, the heron will then stand motionless as it watches the rats foraging, its neck then begins to move from side to side as the heron determines the best time to strike with its sharp bill.