Slender-billed crow (Corvus enca)

Gagak hutan or slender-billed crow (Corvus enca) is a species of animal in the Corvidae, large, dull black birds that eat soft fruit and insects, live in forest habitats, forest edges, coastal areas and spread up to 1600 meters elevation.

C. enca has a size of 45 cm, the fur is black and not as shiny. The beak is large and black, the irises are brown and the legs are black. Fly with short flaps, often perched on twigs on tall and large trees.

Slender-billed crows live in pairs or small groups. Generally solitary. The nest is large and untidy, composed of piles of twigs and placed on the top of a tall tree. Eggs are blue with black spots for 3-4 items. Breeds in November-May.

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Aves
Order: Passeriformes
Family: Corvidae
Genus: Corvus
Species: Corvus enca
Subspecies: Corvus enca ssp. celebensis, Corvus enca ssp. compilator, Corvus enca ssp. enca, Corvus enca ssp. mangoli, Corvus enca ssp. pusillus, Corvus enca ssp. samarensis, Corvus enca ssp. sierramadrensis

Humpback whales (Megaptera novaeangliae) manufacture bubble-nets as tools to increase prey intake

NEWS - Humpback whales ( Megaptera novaeangliae ) create bubble net tools while foraging, consisting of internal tangential rings, and actively control the number of rings, their size, depth and horizontal spacing between the surrounding bubbles. These structural elements of the net increase prey intake sevenfold. Researchers have known that humpback whales create “bubble nets” for hunting, but the new report shows that the animals also manipulate them in a variety of ways to maximize catches. The behavior places humpbacks among the rare animals that make and use their own tools. “Many animals use tools to help them find food, but very few actually make or modify these tools themselves,” said Lars Bejder, director of the Marine Mammal Research Program (MMRP), University of Hawaii at Manoa. “Humpback whales in southeast Alaska create elaborate bubble nets to catch krill. They skillfully blow bubbles in patterns that form a web with internal rings. They actively control details such ...

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