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    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats. They are predatory organism, feeding on other ciliate protozoans, mainly Paramecium — Stock Photo
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats. They are predatory organism, feeding on other ciliate protozoans, mainly Paramecium
    Horse skeleton, realistic 3d rendering. — Stock Photo
    Horse skeleton, realistic 3d rendering.
    Parasitic tick feeding — Stock Photo
    Parasitic tick feeding
    Horse skeleton model with detailed Supraspinatus muscle, digital illustration. — Stock Photo
    Horse skeleton model with detailed Supraspinatus muscle, digital illustration.
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Snouted treefrog (Scinax fuscovarius) eye, close-up. This species is widespread in southern, south-eastern and central Brazil as well as in eastern Bolivia, Paraguay, northern Argentina, and northern Uruguay — Stock Photo
    Snouted treefrog (Scinax fuscovarius) eye, close-up. This species is widespread in southern, south-eastern and central Brazil as well as in eastern Bolivia, Paraguay, northern Argentina, and northern Uruguay
    Arteries in transparent dog body, anatomical computer illustration. — Stock Photo
    Arteries in transparent dog body, anatomical computer illustration.
    Horse anatomy and skeletal system of upper body, computer illustration. — Stock Photo
    Horse anatomy and skeletal system of upper body, computer illustration.
    Structure of dog skeleton, computer illustration. — Stock Photo
    Structure of dog skeleton, computer illustration.
    Thornback ray (Raja clavata), X-ray. — Stock Photo
    Thornback ray (Raja clavata), X-ray.
    Black-headed ground snake lying in twigs. — Stock Photo
    Black-headed ground snake lying in twigs.
    Full dog anatomy with internal organs and skeleton, digital illustration. — Stock Photo
    Full dog anatomy with internal organs and skeleton, digital illustration.
    Dog silhouette with visible musculature on white background, digital illustration. — Stock Photo
    Dog silhouette with visible musculature on white background, digital illustration.
    Scale insects. Coloured scanning electron micrograph (SEM) of scale insects (superfamily Coccoidea) on a leaf. This pest feeds on the plant's sap. It secretes a powdery wax coating that protects it against pesticides and predators — Stock Photo
    Scale insects. Coloured scanning electron micrograph (SEM) of scale insects (superfamily Coccoidea) on a leaf. This pest feeds on the plant's sap. It secretes a powdery wax coating that protects it against pesticides and predators
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Close-up of Aphid body infected by parasitic wasp on grass with dew drops. — Stock Photo
    Close-up of Aphid body infected by parasitic wasp on grass with dew drops.
    Structure of dog skeleton, computer illustration. — Stock Photo
    Structure of dog skeleton, computer illustration.
    Full dog anatomy with transparent internal organs, digital illustration. — Stock Photo
    Full dog anatomy with transparent internal organs, digital illustration.
    Horse skeleton in transparent silhouette on black background, computer illustration. — Stock Photo
    Horse skeleton in transparent silhouette on black background, computer illustration.
    Illustration of schistosoma blood fluke flatworm. — Stock Photo
    Illustration of schistosoma blood fluke flatworm.
    Honey bee on honeycomb — Stock Photo
    Honey bee on honeycomb
    Structure of dog nervous system, computer illustration. — Stock Photo
    Structure of dog nervous system, computer illustration.
    Dog silhouette with visible skeleton on blue background, digital illustration. — Stock Photo
    Dog silhouette with visible skeleton on blue background, digital illustration.
    Five butterflies on a plant stem — Stock Photo
    Five butterflies on a plant stem
    Dog silhouette with red colored lungs on black background, digital illustration. — Stock Photo
    Dog silhouette with red colored lungs on black background, digital illustration.
    House dust mites — Stock Photo
    House dust mites
    Close-up of marmalade hoverfly perched on plant branch. — Stock Photo
    Close-up of marmalade hoverfly perched on plant branch.
    Structure of dog skeleton, computer illustration. — Stock Photo
    Structure of dog skeleton, computer illustration.
    Maggots of house fly — Stock Photo
    Maggots of house fly
    Babesia parasites inside red blood cell, computer illustration — Stock Photo
    Babesia parasites inside red blood cell, computer illustration
    Black field cricket — Stock Photo
    Black field cricket
    Painted lady butterfly — Stock Photo
    Painted lady butterfly
    Horse skeleton model with detailed Tensor fascia lata muscle, digital illustration. — Stock Photo
    Horse skeleton model with detailed Tensor fascia lata muscle, digital illustration.
    Head louse on white background, digital illustration. — Stock Photo
    Head louse on white background, digital illustration.
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Close-up of bag worm moth larval sac covered with twigs. — Stock Photo
    Close-up of bag worm moth larval sac covered with twigs.
    Round worms in human intestine, computer illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species — Stock Photo
    Round worms in human intestine, computer illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    Cat flea head — Stock Photo
    Cat flea head
    Open winged silkmoth perched on branch. — Stock Photo
    Open winged silkmoth perched on branch.
    Close-up of grizzled skipper moth on dried wildflower. — Stock Photo
    Close-up of grizzled skipper moth on dried wildflower.
    Digital illustration of parasitic hookworm Ancylostoma duodenale in small intestine. — Stock Photo
    Digital illustration of parasitic hookworm Ancylostoma duodenale in small intestine.
    Stomach infected with parasitic nematode worms — Stock Photo
    Stomach infected with parasitic nematode worms
    Rhubarb weevil sitting on dried wildflower. — Stock Photo
    Rhubarb weevil sitting on dried wildflower.
    Tapeworm of cattle and other grazing animals, light micrograph. — Stock Photo
    Tapeworm of cattle and other grazing animals, light micrograph.
    Parasitic nematode worm — Stock Photo
    Parasitic nematode worm
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    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.
    Dog silhouette with visible musculature on white background, digital illustration. — Stock Photo
    Dog silhouette with visible musculature on white background, digital illustration.
    Adult head louse — Stock Photo
    Adult head louse
    Dog silhouette with red colored pancreas on black background, digital illustration. — Stock Photo
    Dog silhouette with red colored pancreas on black background, digital illustration.
    Dragonflies on a plant stem — Stock Photo
    Dragonflies on a plant stem
    Horse anatomy and skeletal system of upper body, computer illustration. — Stock Photo
    Horse anatomy and skeletal system of upper body, computer illustration.
    Coiled proboscis of a moth — Stock Photo
    Coiled proboscis of a moth
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Close-up of gossamer winged butterfly larva on wild plant. — Stock Photo
    Close-up of gossamer winged butterfly larva on wild plant.
    Digital illustration of head of parasitic hookworm Ancylostoma duodenale in small intestine. — Stock Photo
    Digital illustration of head of parasitic hookworm Ancylostoma duodenale in small intestine.
    Close-up of noctuid moth on wild plant stem. — Stock Photo
    Close-up of noctuid moth on wild plant stem.
    Australian tree frog on white background. — Stock Photo
    Australian tree frog on white background.
    Female Asian tiger mosquito, colored scanning electron micrograph. — Stock Photo
    Female Asian tiger mosquito, colored scanning electron micrograph.