哪些动物会出汗?

尼基-你好。我的名字是尼基，我住在西澳大利亚的珀斯。我的问题是，什么动物会出汗?我知道马会，但其他人也会吗?

汉娜:那么，汗水——鸟儿和蜜蜂会这样做吗，甚至受过教育的人也会逃跑吗?还是只有人类和马才会出汗?

乔纳森-我叫乔纳森·霍姆斯。我是剑桥大学皇后学院的研究员，也是兽医解剖学的兼职讲师。人类有两种汗腺和两种汗液。我们最熟悉的第一种类型存在于我们全身的皮肤上，并产生水珠。水滴从表面蒸发，冷却皮肤，所以它们对调节我们的体温很重要。然而，这种汗腺和出汗在动物中非常罕见。很少有动物通过出汗来保持身体凉爽。第二种腺体通过分解细胞碎片而不是分泌液滴来形成汗液。该产品颗粒状多，脂肪含量高。对于人类来说，这是一种难闻的汗水，尤其是我们的腋窝。 Most animals do have this sort of sweat gland, but they are fairly few and far between and mostly concentrated around the face and mouth, and around the anus. They seem to be important for keeping the skin soft and flexible. Dogs and cats incidentally have a large number of these sweat glands on their footpads. They're probably there to keep the pads which are just very thick skin, supple, but may also help with grip in the same way that we lick our fingers to make them slightly moist when counting bank notes or turning pages. As Nikki has noted, horses do sweat abundantly. There is a type of protein related to albumin in their sweat which often causes it to froth.

汉娜-谢谢，乔纳森。因此，人类每天可以排出10到14升的汗水，这主要是为了通过蒸发皮肤上的水分来降低体温。此外，它们还会分泌第二种汗液，释放出一种更油腻的脂肪液体，这种液体最终会发出气味，可以用作领土标记或发出恐惧和焦虑的信号。大多数其他动物不做第一种出汗。相反，狗会通过喘气来保持凉爽。但大多数动物确实有第二种汗液，从身体的某些部位渗出，脂肪也能保持皮肤柔软。带着什么问题，我们转向这个…

保罗-你好。我叫保罗，来自英格兰西北部，我的问题是，小型生物是否比大型生物进化得更快?