PNB 2250 Lecture Notes - Lecture 30: Neutral Buoyancy, Thermoregulation, Glycogen
11 Nov 2016
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Animal movement: different mediums (water, air, ground, different movements (swimming, flying, walking, running) Medium: affects gravity (buoyancy, different viscosities (water vs. air, different drag, different coefficient of friction. No energy required to support body weight. Huge advantage: largest animals in ocean. Thermal tissues: most effort to support weight. Birds have from one third to half the density of terrestrial animals. Due to their hollow bones, no glycogen. Streamlining, creating aerodynamic lift: feathers, tails, scales, etc, on land- not the same constraints. Dinosaurs: non-flying dinosaurs also have feathers. Perhaps helped animals to glide and then evolved in flight: though to play a role in thermoregulation or sexual selection. It costs more energy to walk than run (same distance) It costs more energy to run or walk faster but >4km/h better off running: at any given speed- animals select most efficient means of movement.
