Try holding centre of beam OFF the bunny once you have found them...they often will sit thinking perhaps your looking elsewhere,you can still see them in the not so bright outer edge of light. It's a trick we used back in the commercial spotlighting days. Another thought is have person on foot as well as one on bike,if spooky animals encountered let bike move off and then shoot on foot while they focused on bike. I find green easier to see to navigate with... Limited experience but had Kathmandu headlamp with colour options and used it push biking back n forwards to work.
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