0 a large tube, wide at one end, through which large amounts of small separate things, for example seeds, can be moved from one container to another
1 a large tube, wide at one end, through which large amounts of grain, animal food, coal, etc. are moved from one container to another
Single-legged hopping robotics research similar results, when the spring-mass type vertical hopper was controlled with a controller, called periodic forcing controller.
This strategy regulated the hopper at different hopping heights and was efficient even when hopping over obstacles.
There is no doubt that the survivors of the 1932 hopper campaign were reverting to the solitary phase in the area.
The first generation studied were partly composed of stragglers from hopper bands and flying swarms.
They ate large numbers of hoppers and scattered the bands, so that no swarms of adults were produced.
In the northern parts where predators were not so abundant, the bands were nevertheless small, and numbers of green hoppers could be found.
The mass of pellets required to refill hoppers and the mass of spilt pellets were recorded to calculate food consumption per bird per week.
This may explain the occurrence of apparently unparasitised hoppers of the pallid type.
