Laboratório de Tecnologia Educacional BIBLIOTECA DIGITAL               DE CIÊNCIAS

O impacto da seleção natural e artificial na extinção das espécies e o balanço positivo e negativo na reintrodução de espécimes extintos.

The general coloration is light brown, yellow in some parts. The wings are dark brown and there is a small black region behind the eye. The immature individuals have lighter shades of brown in the wings and the chest is streaked in white. Distribution: From southern Amazon to Rio Grande do Sul. Habitat: Open areas, cerrado, caatinga, farms and urban areas. Diet: Feeds on ticks, insects, carrion, small rodents, birds, snakes, lizards and even fishes. Reproduction: The nest is a platform built on the top of tall trees. Natural history: This hawk is associated with cattle because of its behavior of climbing on the back of the cattle in search for ticks and other ectoparasites. It ...

14 cm. The legs, beak and the neck are short. The throat is red, contrasting with the fuliginous sides of the head, the back and the chest that is lighter. The belly is pale yellow. The last feather of the male’s wing is rough. Distribution: From Panama to Argentina. Migrates in the south. Habitat: Open landscapes and cities, generally near the water. Diet: Feeds on insects it catches when flying. Reproduction: Builds a nest digging holes in slopes, sometimes in colonies. Lays three to six white eggs. The couple sleeps together in the nest, but only the female incubates. The couple takes turns to feed the brood. When the offspring leave the nest they remain nearby for some ...

22 cm. The upper parts are brown or grayish. The chest and belly are bright yellow. Distribution: From Texas (U.S.A) to Argentina. Has expanded its distribution, benefited from deforestation. Habitat: Forest borders, cerrado, fields and cities. Diet: Mostly flying insects that it catches in small flights from a perch. Follows fires in order to catch the escaping insects. Also eats fruits. Reproduction: The nest is made of sparse sticks and is usually placed in trees with hives or with plenty of ants in order to increase safety. The offspring, (2 or 3) are fed by the couple. Natural history: Migrates to the north in the southern winter. During this migration it may appear in...

As bactérias do gênero Mycobacterium, entre as quais citamos pela importância os bacilos da tuberculose e hanseníase, dificilmente são tingidos pelos corantes básicos derivados da anilina, porém uma vez corados, fixam fortemente o corante de forma a resistir à ação diferenciadora do álcool e ácidos minerais fortes diluídos.Esta propriedade é conhecida como álcool ácido resistência e é comumente evidenciada em bacteriologia pela coloração proposta por Ziehl-Neelsen.

Informações sobre a espécie pré histórica, espécies que derivaram dos Megalodontes e como esses animais são retratados dos filmes.