A bird's heartbeat depends on the bird in question. A hummingbird for example can have a heartbeat of about 180 beats per minute.
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It seems as though that as you look at smaller birds, their heart rate is higher than larger birds. This would lead you to believe that birds' hearts beat so fast because their small size. To keep up with it's surroundings, as well as simply to fly, the bird has to put out an immense amount of energy and oxygen. These is made up by the heart, which has to beat super fast to compensate.
birds ranges from 20 to 50 miles per hour.
Slow flying birds
Blue tits are quite slow birds; their average speed is about 25-34km/h.
A positive chronotrope is something that increases the heatbeat.
72 beats per minute
No birds can run besides the roadrunner. However the roadrunner is very fast.
The doctor used his stethoscope to listen to the sound of your heatbeat
Is it Clare Calberth She was Dr Summerbee in Heatbeat beat
humming birds fly so fast because they are so fast
Depends on how fast the weasel is.
64km/h They are the fastest birds on land.
Uhm, calm is not having a rapid heatbeat and being excited is having a rapid heartbeat.
Running birds e.g. Ostrich can run fast comparable to horse in a desert .
64km/h They are the fastest birds on land.
Fast birds. Fast fish could also be considered sort of aerodynamic for a different fluid I guess.