A pair of great tits will each fly at least 100 km to collect the caterpillars and carry almost their own body weight in a day. #WildlifeWednesday #Birds #Nature #Wildlife #InstagramBirds #InstaBird #RSPB #WildlifePhotos #NaturePhotography #GreatTits #Feeders #BirdFeeder #Caterpillar 😃🐦