a blog by Matt Clysdale, exploring the little pieces of wilderness in and around the city of Kalamazoo
Friday, February 25, 2011
New Work at the Nature Connection
Tuesday, February 15, 2011
The Hot Months of Winter
Monday, February 14, 2011
Speaking of Valentines Day...
Think those heart-shaped boxes of Valentine’s chocolates are impressive? Compared to the size of a human heart perhaps. But a whale’s heart dwarfs even those samplers that require weightlifters to hoist them.
Picture a heart the size of a car. That’s what a Blue Whale possesses—a heart that deserves its own parking space. And how does a heart like that pump? Very slowly. In fact, a Blue Whale’s heart beats just five or six times per minute when the whale is at the surface and even slower when the animal dives. A human heart, by contrast, typically beats seventy times per minute at rest. And a hummingbird’s heart, for even greater contrast, beats five hundred times per minute at rest and more than a thousand times per minute when the bird flies.
But don’t underestimate the little hummingbird. Its heart is the largest proportionally of any animal. Whereas the average mammal’s heart comprises less than 1 percent of its total body weight, a hummingbird’s heart can be more than twice that figure. For a Blue Whale, that’s the equivalent of a two-car garage.