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    Cross section of nautilus shell with spiral structure. — Stock Photo
    Cross section of nautilus shell with spiral structure.
    Colored scanning electron micrograph of predatory ciliate protozoan Loxophyllum. — Stock Photo
    Colored scanning electron micrograph of predatory ciliate protozoan Loxophyllum.
    Blow fly (Calliphoridae) head, close-up. — Stock Photo
    Blow fly (Calliphoridae) head, close-up.
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.
    Structure of dog nervous system, computer illustration. — Stock Photo
    Structure of dog nervous system, computer illustration.
    Close-up of cluster fly on dried wildflower stem. — Stock Photo
    Close-up of cluster fly on dried wildflower stem.
    Structure of dog nervous system, computer illustration. — Stock Photo
    Structure of dog nervous system, computer illustration.
    Close-up of tiny fly covered by dew drops on frozen wild plant leaf. — Stock Photo
    Close-up of tiny fly covered by dew drops on frozen wild plant leaf.
    Anatomy of dog spleen, zoological digital illustration. — Stock Photo
    Anatomy of dog spleen, zoological digital illustration.
    Stomach infected with parasitic nematode worms — Stock Photo
    Stomach infected with parasitic nematode worms
    Horse skeleton in transparent silhouette on black background, computer illustration. — Stock Photo
    Horse skeleton in transparent silhouette on black background, computer illustration.
    Echinococcus granulosus hydatid cyst, computer illustration — Stock Photo
    Echinococcus granulosus hydatid cyst, computer illustration
    Dog silhouette with red colored spine on black background, digital illustration. — Stock Photo
    Dog silhouette with red colored spine on black background, digital illustration.
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Digital illustration of nit egg of human head louse attached to human hair. — Stock Photo
    Digital illustration of nit egg of human head louse attached to human hair.
    Rhubarb weevil sitting on dried wildflower. — Stock Photo
    Rhubarb weevil sitting on dried wildflower.
    Grivet monkey sitting on tree branch. — Stock Photo
    Grivet monkey sitting on tree branch.
    Lioness lying down and resting, Ngorogoro, Tanzania. — Stock Photo
    Lioness lying down and resting, Ngorogoro, Tanzania.
    Close-up of orange knee sawfly beetle on plant stem. — Stock Photo
    Close-up of orange knee sawfly beetle on plant stem.
    Horse skeleton model with detailed Subclavius muscle, digital illustration. — Stock Photo
    Horse skeleton model with detailed Subclavius muscle, digital illustration.
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation — Stock Photo
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation
    Beetle (Macrodontus cervicornis), X-ray. — Stock Photo
    Beetle (Macrodontus cervicornis), X-ray.
    Adult female mosquito — Stock Photo
    Adult female mosquito
    Veins in transparent dog body, anatomical computer illustration. — Stock Photo
    Veins in transparent dog body, anatomical computer illustration.
    Tick biting skin — Stock Photo
    Tick biting skin
    Cluster fly sitting on dried wildflower stem. — Stock Photo
    Cluster fly sitting on dried wildflower stem.
    Close-up of German cockroach insect head, detailed macrophotography. — Stock Photo
    Close-up of German cockroach insect head, detailed macrophotography.
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Blue colored dust mite, digital illustration. — Stock Photo
    Blue colored dust mite, digital illustration.
    Dog silhouette with visible musculature on white background, digital illustration. — Stock Photo
    Dog silhouette with visible musculature on white background, digital illustration.
    Full dog anatomy with skeleton and internal organs, digital illustration. — Stock Photo
    Full dog anatomy with skeleton and internal organs, digital illustration.
    Close-up of black Lypusa maurella moth on dried stem. — Stock Photo
    Close-up of black Lypusa maurella moth on dried stem.
    Buffalo mother and baby on field during great migration in Serengeti, Tanzania. — Stock Photo
    Buffalo mother and baby on field during great migration in Serengeti, Tanzania.
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    Two small snails on pink flowers in water with falling droplets and mirrored image. — Stock Photo
    Two small snails on pink flowers in water with falling droplets and mirrored image.
    Digger bee (Habropoda sp.) sleeping on a branch. Its turquoise compound eyes are visible here. — Stock Photo
    Digger bee (Habropoda sp.) sleeping on a branch. Its turquoise compound eyes are visible here.
    Adult parasitic louse — Stock Photo
    Adult parasitic louse
    Close-up of common glow worm hanging on branch. — Stock Photo
    Close-up of common glow worm hanging on branch.
    Obese boy using binoculars outdoors. — Stock Photo
    Obese boy using binoculars outdoors.
    Cat flea. Coloured scanning electron micrograph (SEM) of a cat flea (Ctenocephalides felis). Its body is laterally-flattened to allow it to move easily through the fur of its cat host — Stock Photo
    Cat flea. Coloured scanning electron micrograph (SEM) of a cat flea (Ctenocephalides felis). Its body is laterally-flattened to allow it to move easily through the fur of its cat host
    Digital illustration of Lyme disease tick parasite. — Stock Photo
    Digital illustration of Lyme disease tick parasite.
    Horse skeleton in transparent silhouette on black background, computer illustration. — Stock Photo
    Horse skeleton in transparent silhouette on black background, computer illustration.
    Digital illustration of female lyme disease tick — Stock Photo
    Digital illustration of female lyme disease tick
    Parasitic louse on human head skin, digital illustration. — Stock Photo
    Parasitic louse on human head skin, digital illustration.
    Pink colored dust mite, digital illustration. — Stock Photo
    Pink colored dust mite, digital illustration.
    Horse skeleton in transparent silhouette on black background, computer illustration. — Stock Photo
    Horse skeleton in transparent silhouette on black background, computer illustration.
    Parasitic dust mite on white background, digital illustration. — Stock Photo
    Parasitic dust mite on white background, digital illustration.
    Parasitic Cylindromyia fly on a dried wild flower head. — Stock Photo
    Parasitic Cylindromyia fly on a dried wild flower head.
    Structure of dog vascular system with colorful blood vessels in transparent body, computer illustration. — Stock Photo
    Structure of dog vascular system with colorful blood vessels in transparent body, computer illustration.
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Brown rose chafer (Cetonia aurata) on a lichen covered branch. — Stock Photo
    Brown rose chafer (Cetonia aurata) on a lichen covered branch.
    Silver Y moth caterpillar feeding on honeysuckle leaf. — Stock Photo
    Silver Y moth caterpillar feeding on honeysuckle leaf.
    Orange knee sawfly sitting on plant stem. — Stock Photo
    Orange knee sawfly sitting on plant stem.
    Horse anatomy with visible internal organs, computer illustration. — Stock Photo
    Horse anatomy with visible internal organs, computer illustration.
    Close-up of flower crab spider in hunting position on wildflower. — Stock Photo
    Close-up of flower crab spider in hunting position on wildflower.
    Close-up of devils coach horse beetle with large mandibles. — Stock Photo
    Close-up of devils coach horse beetle with large mandibles.
    Arteries in transparent dog body, anatomical computer illustration. — Stock Photo
    Arteries in transparent dog body, anatomical computer illustration.
    Echinococcosis multilocularis hydatid cyst, computer illustration — Stock Photo
    Echinococcosis multilocularis hydatid cyst, computer illustration
    Dog anatomy with visible organs on black background, digital illustration. — Stock Photo
    Dog anatomy with visible organs on black background, digital illustration.
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum — Stock Photo
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum