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Pygmy Shrew
The Pygmy Shrew has one of the most peculiar hearts of any animal on the planet. This tiny mammal has an unusually large heart relative to its body size, which is approximately the size of a human thumb. Its heart is also unusual in its shape, being more elongated than the round heart of most mammals. This gives the Pygmy Shrew a much higher metabolism, allowing it to remain active for long periods of time. Furthermore, its heart beats at an incredibly fast rate — up to 1,200 beats per minute — helping it to maintain its energy levels and stay alert for any predators.
