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Phylym Platyhelmenthes or flat worms.
Fish skeleton on black background
Rainbow shark catfish Epalzeorhynchos frenatum aquarium fish isolated on white
Blackeye Goby, bluespot goby, and crested goby, Rhinogobiops nicholsii, Pacific Coast of California.\nFamily Gobiidae
Ancistrus Tropical fish, Bristlenose catfish, Cleaner Fish on the glass
Orange shrimp between green plants in water
A fish The three-spined stickleback (Gasterosteus aculeatus) on the background of a 5 mm measurement grid. Ichthyology research.
The palmate newt
discus fish red melon strain
Axolotl. Mexican walking fish. Ambystoma mexicanum
Top view of spiny goby fish isolated on white background, Pseudapocryptes elongatus
The study of Tapeworm infection is caused by ingesting food or water contaminated with tapeworm eggs or larvae in laboratory.
Cute pet fish
Spiny Loach fish, Lepidocephalichthys thermalis, Satara, Maharashtra, India
a hummingbird perches on a branch near Patagonia, Arizona
The Sturgeon fingerlings 9days old 10mm sized.  The Sterlet (Acipenser ruthenus). Extremely closeup - microphotography.
Hexagrammos lagocephalus is a colorful marine fish with the common name rock greenling in the greenling family.
Ancistrus Tropical fish, Bristlenose catfish, Cleaner Fish on the glass
Three-spined stickleback, Gasterosteus aculeatus,
Goby fish (Bathygobius fuscus)
Aquatic (fresh water) nematode living in pond water among cyanobacteria. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.
XIAOYI DIGITAL CAMERA
Underwater swimming two common rudd fish (Scardinius erythrophthalmus) together at the bottom of a lake.
Gyrodactylus is ectoparasitic flatworms infections in fish.
Aquarium tropical fish: otocinclus
Common Frog, Rana temporaria tadpole with internal gills, 3 weeks after hatching, in front of white background
Taxon name: Black-headed Honeyeater\nTaxon scientific name: Melithreptus affinis\nLocation: Hobart, Tasmania, Australia
Hydra, fresh-water polyp under the microscope. (Hydra vulgaris) 40x magnified.
The bronze mannikin or bronze munia (Spermestes cucullata) is a small passerine (i.e. perching) bird of the Afrotropics. This very social estrildid finch is an uncommon to locally abundant bird in much of Africa south of the Sahara Desert, where it is resident, nomadic or irruptive in mesic savanna or forest margin habitats. It has an estimated global extent of occurrence of 8,100,000 km2. It is the smallest and most widespread of four munia species on the African mainland, the other being black-and-white, red-backed and magpie mannikin. It co-occurs with the Madagascar mannikin on the Comoro Islands, and was introduced to Puerto Rico. Especially in the West Africa, it is considered a pest in grain and rice fields. It is locally trapped for the pet bird trade.
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