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Brazil’s pied tamarin monkeys use scent marking and vocal calls to communicate, but it’s getting more difficult for them to hear one another.

• New study finds that most Rafflesia species, which produce the world’s largest flowers, face extinction. • Lack of protection at local, national, and international levels means that remaining populations are under critical threat. • Researchers propose an urgent action plan to save these remarkable flowers, building on local success stories.

Most plants in the Rafflesia genus – which have the largest known flowers in the world – are under threat of extinction.

New research has found that monkeys increase their use of scent markings to compensate for human noise pollution. The study, led by researchers from Universidade Federal do Amazonas in Manaus, Brazil, and Anglia Ruskin University in Cambridge, England, is the first to investigate how primates change their communication strategies in response to noise pollution. The researchers studied endangered pied tamarins (Saguinus bicolor), which use both vocal calls and scent markings. The researchers found that the frequency of scent marking directly increased in line with noise decibel levels.

Here are a few of the best eco-tourism places to visit and appreciate some of Earth's most threatened creatures