Brazilian otter or giant otter inhabiting the Amazon rainforest is a mammal of the marten family. The Orinoco is one of the rivers belonging to the river system where this predatory animal lives. The freshwater Brazilian otter is considered the largest specimen in the otter subfamily. This animal reaches two meters in length including a seventy-centimeter tail and weighs more than 20 kg. Activity in the daytime distinguishes the giant otter from its relative, the European otter, which is a nocturne animal.
The Brazilian predator is often found on the banks of South American rivers. Here, animals in groups from three to eight individuals hunt for fish and drive it towards each other for convenience. On land, the animals feed on rodents and bird eggs. There are up to five babies in one litter of a giant otter. After ten months, young otters grow to the size of adults, and become sexually mature males and females at the age of two years. In average, Brazilian predators live for ten years.