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    Thistle bud weevil sitting on common thistle flower. — Stock Photo
    Thistle bud weevil sitting on common thistle flower.
    Bird bone tissue — Stock Photo
    Bird bone tissue
    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.
    Horse skeleton model with detailed Transversus thoracis muscle, digital illustration. — Stock Photo
    Horse skeleton model with detailed Transversus thoracis muscle, digital illustration.
    Round worms in human intestine, illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species — Stock Photo
    Round worms in human intestine, illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species
    Close-up of malachite beetle sitting on wild plant. — Stock Photo
    Close-up of malachite beetle sitting on wild plant.
    Tick showing its mouthparts — Stock Photo
    Tick showing its mouthparts
    Bee fly hanging on plant stem. — Stock Photo
    Bee fly hanging on plant stem.
    Dog roundworm eggs (Toxocara canis), light micrograph. — Stock Photo
    Dog roundworm eggs (Toxocara canis), light micrograph.
    Light micrograph (LM) of a medusa (young polyp) from the Obelia geniculata hydroid. — Stock Photo
    Light micrograph (LM) of a medusa (young polyp) from the Obelia geniculata hydroid.
    Hydatid disease in liver, cystic echinococcosis, Computer illustration — Stock Photo
    Hydatid disease in liver, cystic echinococcosis, Computer illustration
    Head louse on white background, digital illustration. — Stock Photo
    Head louse on white background, digital illustration.
    Dolphin's dorsal fin appearing above water — Stock Photo
    Dolphin's dorsal fin appearing above water
    Anatomy of dog stomach in transparent body, digital artwork. — Stock Photo
    Anatomy of dog stomach in transparent body, digital artwork.
    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
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Enterobius vermicularis threadworm eggs containing worm larvae, causative agent of enterobiasis, computer illustration. — Stock Photo
    Enterobius vermicularis threadworm eggs containing worm larvae, causative agent of enterobiasis, computer illustration.
    Horse anatomy with visible internal organs, computer illustration. — Stock Photo
    Horse anatomy with visible internal organs, computer illustration.