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Sound recording. Crackling noise is overhead powerline. You'll absolutely need headphones to hear the tree frog calls over the birds and microphone noise.
Live larvae extracted from three living fledgling barn swallows (legally, by wildlife rehabbers). Each was about the length of a grain of rice and the diameter of a mealworm, and were present all over the swallow’s bodies, especially in the head and neck area. They were all well under the skin with a hole through which to breathe and responded to touch by retreating further into the hole. I know the picture isn’t great for ID but hopefully adding the host + size can help narrow it down.
Look in the lower right. Terrbile picture, but they are fast and it was dusk. Best I could do.