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All of the examples showed altruistic behaviors and the behaviors helped the species survive. In my opinion, altruistic behavior is needed when the population is trying to survive. Altruistic behavior helps both species and helps them survive.

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The fourth example is of rats in a study. According to https://www.seeker.com/helpful-humpback-whales-altruistic-animal-photos-1769918539.html, "Rats do exhibit selfless behavior, find researchers at Champalimaud Centre for the Unknown, in Lisbon, Portugal. Experimenters placed rats into pairs and provided one of the rats a choice: open one door and get a food morsel for yourself; open another and both rats receive a reward. Out of 15 rats tested, all but one made unselfish choices consistently." The rats showed altruistic behaviors by opening the door the door that fed both of the rats. Therefore an example of animal displaying altruistic behavior is rats.

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The third example is of Humpback whales protecting seals when being trapped by Killer whales. According to http://www.naturalhistorymag.com/exploring-science-and-nature/131929/save-the-seal, "The killer whales moved on, and fifteen minutes later they spotted a crabeater seal on an ice floe. They created a wave that broke up the floe and left the distraught seal on a piece of ice not much bigger than it was. Just when it seemed the killers were about to have their way, the same pair of humpbacks charged in, swimming around the floe, bellowing and thrashing the water. The killer whales seemed annoyed and finally left the seal alone, still safe on the floe." The Humpback whales showed altruistic behavior by protecting the seals that were getting cornered by the Killer whales. Therefore, an example of an animal displaying altruistic behavior is the Humpback whales.

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The second example is that a group of Sperm whales took in a Bottlenose dolphin. According to http://goodnature.nathab.com/is-animal-altruism-real/, "Recently, when a group of sperm whales about a thousand miles off the coast of Lisbon, Portugal, took in an adult bottlenose dolphin, behavioral ecologists were puzzled. While cross-species interactions are not uncommon among terrestrial animals, sperm whales are not known for forging nurturing bonds with other species. Such an alliance had never been witnessed before.
For eight days, the dolphin traveled, foraged and played with the adult whales and their calves. When it rubbed its body against the whales, they would sometimes even return the gesture. What makes this story even more fascinating is that the dolphin had an S-shaped, spinal deformity." The Sperm whales decided to look after the dolphin because it would struggle to be on its own. Therefore, an example of an animal displaying altruistic behavior is the Sperm whales.

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The first example is of a bottlenose dolphin who showed altruistic behavior to whales and swimmers. According to http://goodnature.nathab.com/is-animal-altruism-real/,  "In fact, in 2008, one bottlenose dolphin came to the rescue of two beached whales in New Zealand and led them into safe waters. Without the dolphin’s guidance, the whales surely would have died. In another incident in New Zealand, a group of swimmers were first surprised when dolphins began circling around them, tighter and tighter, splashing in the water. The swimmers initially thought the dolphins were displaying aggressive behavior, but it turned out that they were warding off sharks." The bottlenose dolphin decide to risk its own life in order to protect the beached whales and the swimmers. Therefore, an example of an animal displaying altruistic behavior is the bottlenose dolphin.

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"Altruistic Behavior: Definition & Examples". (n.d.). Retrieved April 19, 2018, from https://study.com/academy/lesson/altruistic-behavior-definition-examples.html.
Al-Khatib, T. "When Animals Help Each Other". (2016). Retrieved from April 19, 2018, https://www.seeker.com/helpful-humpback-whales-altruistic-animal-photos-1769918539.html.
"Is Animal Altruism Real?' (2017). Retrieved from http://goodnature.nathab.com/is-animal-altruism-real/.
"Save the Seal!" (n.d.). Retrieved from http://www.naturalhistorymag.com/exploring-science-and-nature/131929/save-the-seal.

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Altruistic behavior is that the well-being of others is more important than the well-being or survival of themself. Altruistic Behavior involves selfless acts that put the health of others before one's own.