Photos of warble in yearling hind. This animal was found dead and traveler wanted to know why it had died. He felt they had contributed to cause of death. For those unfamiliar with life cycle of Deer warbles ( Hypoderma diana ) Fly activity is at peak when calves born so they can become a sitting target. The eggs are laid on the hair, hatch and penetrate the skin. They then migrate through the tissues to reach the back,near the spine. THe skin over the larvae weakens and they hatch over the following summer to repeat the cycle. The skin then heals to leave a scar.
Thank you to traveler for forwarding these photos to me and permission to post them.