Fishing for bigeye bat

 Bigeye bats have the ability to remold its two beeps(fish finder); that is, depending on what interests them, they can lengthen and shorten one another. To hunt insects buzzing the importance of both is similar, but when fishing, the second buzz is much shorter, until even disappear in some cases.

The first step to meet the specific stimulus that corresponds has been to discover what kind of stimuli respond bats. And for this, the research group of the analyzed the behavior of bats
(Humminbird fish finders)between three different situations.

 As  researcher explains, "one of the stimuli provoke waves in water, for no apparent prey. In another, we put a fish that was still in the water, with the upper lip out of the water.

And the last stimulus was a fish rising and falling, appearing and disappearing and creating ripples in the water. " As a result of this observation, the research team realized that bats only respond to stimuli in which the dam was visible, ignoring water waves(marine radar).

Known that information, proceeded to study the differences between the fish and was still appearing and disappearing, with a clear objective: to find out if the fish identified based on their morphology or movement.

And the correct answer was the second, and they observed that the reaction to the two stimuli was similar to the reaction shown against insects and fish.

"When a fish is still attacking it as if it were an insect, with short hauls surface and using the two
(Bow thruster)buzzes similarly. But when the fish disappears, they made deeper and long hauls and relegate the buzz pulses of the first type, in the same way that occurs when fish, "says the researcher.

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When the prey disappears

The technique used by bats to fish is more fatiguing than they used to hunt insects
The technique used by bats to fish is more fatiguing than they used to hunt insects, as the friction that occurs when entering the legs under water causes them great loss of kinetic energy. Therefore, use continuously fishing technique is not helpful to them if the fish are not fish on most attempts(garmin fish finders).

 To learn how bats react when the dam disappears, the research group designed a last experiment. At various times of bat hunting action they have dipped the fish in order to analyze changing patterns of flight and echolocation.

The response of the bat was not yes / no, but gradual. That is(marine battery charger), the disappearance of fish and game pattern change are related. The intensity of the drag conform to the uncertainty of the location of the dam, and the pattern of echolocation it conform to receive the type of information that interests them. Such behavior regulation, therefore, could be the important element that makes fishing profitable.