18/11/2020
Do you know there are some birds which are smaller than butterflies?
Typically, we know that birds fly onwards. But, can you imagine that there are some birds which can even fly backwards?
Besides, they have neither sense of smell nor good colour vision.
Guess which bird it can be?
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Well, the waiting is over, and I'm gonna tell you about the smallest bird in the world. Yes,u are right. This is hummingbird.
Interesting that Hummingbirds can't walk or hop, only perch and move sideways. They are native to the Americas and constitute the biological family Trochilidae. Of them, the smallest extant hummingbird species is the 5 cm (2 inches) which weighs less than two gram. And the most fantastic factor is that they are called hummingbirds because of the humming sound created by their beating wings, which flap at high frequencies audible to humans. The evolutionary hummingbird tree shows ancestral hummingbirds splitting from insectivorous swifts (family Apodidae) and treeswifts (family Hemiprocnidae) about 42 million years ago, probably in Eurasia. One key evolutionary factor appears to have been an altered taste receptor that enabled hummingbirds to seek nectar. They have the highest mass-specific metabolic rate of any homeothermic animal.
What's the meaning of homeothermy? Well, homeothermy is thermoregulation that maintains a stable internal body temperature regardless of external influence.
Hummingbirds fall into nine clades defining their relationship to nectar-bearing flowering plants and the birds' continued spread into new geographic areas.
While all hummingbirds depend on flower nectar to fuel their high metabolism and hovering flight, coordinated changes in flower and bill shape stimulated the formation of new species of hummingbirds and plants due to this exceptional evolutionary pattern, as many as 140 hummingbird species can coexist in a specific region, such as the Andes range and these mountains appear to be an incredibly rich environment for hummingbird evolution.
Even though they are the smallest birds in the world, their migration can span hundreds or thousands of miles.
Most of the hummingbirds of North America do migrate seasonally between northern breeding grounds and southern wintering grounds.
Another interesting fact is that they migrate during the day, staying low in the air to watch closely for feeding opportunities, and rest at night. They had got an important position in myths and literature. Aztecs wore hummingbird talismans as a symbol of their vigour,energy and working all together.Hummingbird talismans were prized as drawing sexual potency, strength, power, and skill at arms and warfare to the wearer.
One of the Nazca Lines depicts a hummingbird.
In Trinidad and Tobago, hummingbirds are given a place on their nation's coat of arms,1 cent coin and emblem of its national airline Caribbean Airlines.
Let me inform you of the astonishing fact that No other birds can fly like hummingbirds. They can fly forward, backward and even upside down!
Hummingbirds are also the only vertebrae. Isn't it just wow? Recent Search Trends Study substantiates that people from our Capital Dhaka and Chittagong are very inquisitive about this little bird. So it can be said that people are showing sheer curiosity about those little birds.
Ok, guys in the next video we would come with another new fantastic topic. Till then, stay safe, stay blessed.
Sayonara!!
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