Vampire bats Kooperation im Tierreich
Vampire bats are believed to be the only species of bats in the world to "adopt" another young bat if something happens to the bat's mother.[11] Vampire bats also share a strong family bond with members of the colony, which is believed to be why they are the only bats to take up this adoption characteristic. Another unique adaptation of vampire bats is the sharing of food. A vampire bat can only survive about two days without a meal of blood, yet they cannot be guaranteed of finding food every night. This poses a problem, so when a bat fails to find food, it will often "beg" another bat for food. The "host" bat may regurgitate a small amount of blood to sustain the other member of the colony. This has been noted by many naturalists as an example of reciprocal altruism in nature.[12] Vampire bats also engage in social grooming.[13] It usually occurs between females and their offspring, but it is also significant between adult females. Social grooming is mostly associated with food sharing.[13]
The mothers suck the blood out of other animals, such as cows, and then bring the blood back for the kids. They are social animals and will feed others' offspring as well. Research has been done in which mother vampire bats were captured and had their blood sacs filled with air so that it would appear to the other bats that they had a lot of good blood to share. When they returned to the nest and did not share, others took note and were then didn't help the research bat's offspring the next time they returned with blood food.
The mothers suck the blood out of other animals, such as cows, and then bring the blood back for the kids. They are social animals and will feed others' offspring as well. Research has been done in which mother vampire bats were captured and had their blood sacs filled with air so that it would appear to the other bats that they had a lot of good blood to share. When they returned to the nest and did not share, others took note and were then didn't help the research bat's offspring the next time they returned with blood food.
Als Reziproken Altruismus bezeichnet man den Altruismus zwischen Nicht-Verwandten. Es stellt sich dabei aber die Frage, ob sich der andere tatsächlich revanchieren. Dieses Verhaltensform beschränkt sich deshalb auch auf Tiere die sich gut kennen.
Bsp.: Vampirfledermaus gibt erfolglosem Tier Blut ab, da es nach 3 Tagen ohne Nahrung sterben würde.
Dabei muß der, mit dem geteilt wird, in mindestens 60% der Fälle am gleichen Schlafplatz geschlafen haben oder verwandt sein.
Nebenhenne schiebt der Haupthenne ein Ei unter. Für sie ist das die einzige Möglichkeit sich fortzupflanzen. Die Haupthenne legt diese Eier zum Schutz der eigenen an den Rand, wo sie Freßfeinden als erstes zum Opfer fallen.
Bei Vögeln gibt es Bruthelfer, die selbst keine eigenen Eier haben.
Bei Hausmäusen ziehen die Weibchen eines Männchens die Jungen gemeinsam in einem Nest auf. Alle Weibchen säugen die Jungen.
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