Creepy crawlies are on the menu at a museum in Costa Rica this week as part of a new exhibition designed to show that insects can be an alternative - and nutritional - source of food.

From crickets in chocolate to beetles with sunflower seeds, visitors to the Museo de Insectos in the capital, San Jose, can enjoy an unusual culinary feast.

Federico Paniagua, a biologist who organised the exhibition, says there are more than 2,000 edible insect species worldwide, including more than 500 in nearby Mexico.

However, says Paniagua, eating insects is something of a taboo across Central America.

That's because it's seen as "disgusting that they come from dirty places" - although "that's not always the case", he says.

On the menu on Wednesday - "beetle larvae toffee", lovingly made on site by biology students who carefully picked each larva before cooking them all in a saucepan.

At least one hungry visitor was impressed, saying it tasted "good ... like toffee, just with cockroaches and larvae."

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