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01:54Convergent Evolution
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
01:24Absolute Motion Analysis- General Plane Motion
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As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
00:53Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
01:07Speciation Rates
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00:48Optimal Foraging
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Published on: March 10, 2021
Hovering and intermittent flight in birds.
1Field Research Station at Fort Missoula, Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA. bret.tobalske@mso.umt.edu
Bioinspiration & Biomimetics
|November 25, 2010
Summary
Bird flight mechanics, including hummingbird hovering and intermittent flight, offer insights for autonomous drones. Understanding these natural flight styles can lead to more efficient and advanced aerial vehicle designs.
Area of Science:
- Biomechanics
- Robotics
- Aerodynamics
Background:
- Hummingbirds, the smallest flying vertebrates, uniquely sustain hovering flight.
- Intermittent flight (flap-bounding and flap-gliding) is common in birds and conserves energy.
- These avian locomotion styles present opportunities for bio-inspired autonomous flying vehicle development.
Purpose of the Study:
- To analyze the biomechanics of hummingbird hovering and avian intermittent flight.
- To identify key features and mechanisms in these flight styles for potential application in autonomous vehicles.
Main Methods:
- Review of hummingbird anatomy and flight dynamics, focusing on wing kinematics and power requirements.
- Analysis of intermittent flight strategies (flap-bounding and flap-gliding) in various bird species.
Main Results:
- Hummingbird hovering relies on high wingbeat frequency, massive flight muscles, and wing supination generating asymmetric lift.
- Unsteady mechanisms like LEV and rotational circulation are crucial for hummingbird hovering efficiency.
- Intermittent flight strategies like flap-bounding and flap-gliding offer energy savings, with flap-bounding limited by bird size.
Conclusions:
- Bird flight, particularly hummingbird hovering and intermittent flight, provides valuable models for autonomous flying vehicle design.
- Understanding avian aerodynamic principles and energy-saving strategies can advance drone technology.
- Further research into these natural flight systems can inspire novel robotic flight capabilities.