We often use birds as a guide to what is happening in nature ( canary in the coalmine sort of thing). In this case the birds are flying as part of a unity ( ring) which is nature. The silhouettes can be read as positive ( just birds flying) or negative.. these species have vanished. The few solid birds maybe all that’s left and my small characters ( emphasizing the birds high in the sky) are pointing at a rare sight. My birds on the top are watching the changes and sort of presage real birds sitting there but also are maybe just a touch of humour in a worrying situation. Again with a change of scale it takes on a whole new aspect hopefully emphasizing the scale of the problem..