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    Red-shafted northern flicker peeking from tree hollow, close-up. — Stock Photo
    Red-shafted northern flicker peeking from tree hollow, close-up.
    Adult boreal owl peering from nest in tree hollow. — Stock Photo
    Adult boreal owl peering from nest in tree hollow.
    Pair of acorn woodpeckers perched at hollow nest in tree, close-up. — Stock Photo
    Pair of acorn woodpeckers perched at hollow nest in tree, close-up.
    Wild Honey Bees In A Hollow Tree (Apis Mellifera); Toronto, Ontario, Canada — Stock Photo
    Wild Honey Bees In A Hollow Tree (Apis Mellifera); Toronto, Ontario, Canada
    Great horned owl and owlet siting in tree hollow, close-up. — Stock Photo
    Great horned owl and owlet siting in tree hollow, close-up.
    Pileated woodpecker perched on aspen tree with hollow, low angle view. — Stock Photo
    Pileated woodpecker perched on aspen tree with hollow, low angle view.
    Lineated woodpecker in tree hollow in Costa Rica. — Stock Photo
    Lineated woodpecker in tree hollow in Costa Rica.
    Lineated woodpecker perched on tree in Costa Rica. — Stock Photo
    Lineated woodpecker perched on tree in Costa Rica.
    Pileated woodpecker feeding ant to chick at hollow nest, close-up. — Stock Photo
    Pileated woodpecker feeding ant to chick at hollow nest, close-up.
    Wild Honey Bees In A Hollow Tree (Apis Mellifera); Toronto, Ontario, Canada — Stock Photo
    Wild Honey Bees In A Hollow Tree (Apis Mellifera); Toronto, Ontario, Canada
    Yellow-shafted northern flicker perched at tree hollow, close-up. — Stock Photo
    Yellow-shafted northern flicker perched at tree hollow, close-up.
    Tropical bird with red beak peeking out of tree hollow in daylight on blurred background — Stock Photo
    Tropical bird with red beak peeking out of tree hollow in daylight on blurred background