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A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
The "true" tree frogs belong to the family Hylidae, but members of other frog families have independently adopted an arboreal habit, a case of convergent evolution. These include the glass frogs (Centrolenidae), the bush frogs (Hyperoliidae), some of the narrow-mouthed frogs (Microhylidae), and the shrub frogs (Rhacophoridae). [ 111 ]
Food is mostly selected by sight, even in conditions of dim light. Movement of the prey triggers a feeding response. Frogs have been caught on fish hooks baited with red flannel and green frogs (Rana clamitans) have been found with stomachs full of elm seeds that they had seen floating past. [142]
The food sources of the crab-eating frog are mainly determined by the locally available prey. Near fresh water, its diet consists largely of insects. But in an environment with brackish water, small crustaceans , including crabs , form the main part.
Warty frog species tend to be called toads, but the distinction between frogs and toads is informal, not from taxonomy or evolutionary history. An adult frog has a stout body, protruding eyes , anteriorly-attached tongue , limbs folded underneath, and no tail (the tail of tailed frogs is an extension of the male cloaca).
Batrachoididae / b æ t r ə ˈ k ɔɪ d ɪ d iː / is the only family in the ray-finned fish order Batrachoidiformes / b æ t r ə ˈ k ɔɪ d ɪ f ɔːr m iː z /.Members of this family are usually called toadfish or frogfish: both the English common name and scientific name refer to their toad-like appearance (batrakhos is Greek for frog).
They are found in and near lakes, rivers and wetlands in the Andean highlands at altitudes between 1,000 and 5,200 m (3,300–17,100 ft). [6] The genus includes two of the world's largest fully aquatic frogs, the Lake Junin frog ( T. macrostomus ) and Titicaca water frog ( T. culeus ), [ 7 ] but the remaining are considerably smaller.
The pelagic food web, showing the central involvement of marine microorganisms in how the ocean imports nutrients from and then exports them back to the atmosphere and ocean floor. A marine food web is a food web of marine life. At the base of the ocean food web are single-celled algae and other plant-like organisms known as phytoplankton.