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activity aggressive alert allelomimetic behavior amateur amphibians angle of view animal behavior animal's bait band basic bats batteries become behavior patterns behavior watching binoculars birds bite blind body breeding butterflies camera captive care-giving behavior care-soliciting cloth clues color courtship creatures deer device elimination environment ethogram exit pupil feeding female field Figure fish fixed action patterns frogs glasses habitats havior hibernation home range human hypothermia individual ingestive insects involves keep lenses light little brown bats live trap locate magnification mammals maps marking mating microphone migration move movements nest normal notes particularly plastic poison ivy population possible postures predators psychological bonding record relatively response scat scent season signals skill skin snakebite social sound species spotting scopes squirrels stalking tape technique temperature tend territory tick tion track underwater usually venom wild wildlife observer wildlife watcher young