Yet smells are still having a greater impact than we realise, warning of danger, triggering memories and even helping us choose a partner.

Many studies have shown that pheromones emitted from the sweat glands play an important role in physical attraction.

Some experts believe that humans have a far greater sense of smell than previously thought but daily showers and fridges, which mask bad odours, have stopped us noticing.

Previously it was estimated that we could smell 10,000 odours but now researchers say it is more like one trillion.

Scientists believe our sense of smell is much closer to that of animals than appreciated, but we no longer pay attention because smells are often hidden, meaning that important information is lost.

Mammal Number of genes

Elephant 1948

Cow 1186

Dog 811

Horse 1066

Rabbit 768

Guinea Pig 796

Rat 1207

Mouse 1130

Marmoset 366

Macaque 309

Orangutan 296

Chimapanzee 380

Human 396

如果你想知道大象是怎么闻气味的，科学家们找到答案了。

据《每日电讯报》网站报道，研究人员发现，非洲大象拥有数量最多的基因，这些基因有利于所有哺乳动物的嗅觉。

鉴于其鼻子的大小以及其对他们生存的重要性，大象的鼻子不仅是动物王国里最长的，它无疑也是嗅觉最灵敏的。

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