caption: The image shows three birds standing on the ground next to each other, with one of them being a house martin. The birds are standing close together, with the one in the middle slightly ahead of the other two. The house martins are both black and white in color, with a grey back and wings, and a white underside. They have a long, thin beak and a black head and neck, and their wings are spread out as if they are about to take flight.