While resident orcas will remain in the same pod for life, this is not the case for transient orcas. Photo of orcas Unna, Kyuqout and Tuar was taken on July 24th, 2008 by yours truly.
In response I got from Yovani Valdes regarding my first blog entry that was about frequently asked questions about orcas, I decided to add a sequal to that blog entry. This entry is all based off six of seven questions that were asked by Yovani and the one other question that I have found on yahoo.com.
1. How are new pods formed?
Females will begin to branch off from from their birth pods when they start having calves of their own. From there on, they will eventually start new lines of their own even though they will continue to travel closely with their mothers and other family members.
2. How large can pods get?
Orca pod sizes can range from two to forty animals.
3. What’s a transient pod?
Most transient orcas may have short term associations with other pods from time to time. Photo by National Geographic.
Transient orca pods are small loosely-based social structures that may consist of an adult female and two or three of her offspring. However, while the eldest male calf will remain with the mother for life, the other calves must leave her. Transient calves will leave their mother’s pod at around 5-12 years. Females have been known to travel with other transient animals who they may or may not be related too while males will travel with one group after another for time to time. However, the only exception to this rule is if female offspring fail to produce any offspring of her own and will remain with the mother for life.
4. What are the intervals between births?
Born year around, killer whale calves may nurse from their mothers for up to two years. Photo of Katina with her son Makaio was by taken by yours truly in July 2011.
Female orcas will give birth to a single calf every 3-5 years. On average, females will probably give birth to 4-6 calves during her lifetime.
5. When do they start breeding and until what age?
While female orcas will mature at around 7 to 10 years of age, it could be another six to nine years before they have their first calf. The average age for females to give birth for the first time is around 11-15 years. They become post-reproductive in their mid-forties.
6. Why do dorsal fins bend?
There are a series of theories about why an orca's dorsal fin bends. photo is by Public Domain
Although it’s not really known why an orca’s dorsal fin bends, many believe that gravity may have something to do with it. For example, when orcas dive under water, the surrounding water helps support the dorsal fin which is made of nothing more than muscle and connective tissues. Also, orcas who spend most of their time at the surface with their fins protruding out of the water has greater chances of flipping over on a long-term scale. Additionally, the collagen becomes more flexible when warm such as exposure to the sunlight. However, there are also theories about collapsed dorsal fins being genetic (there there’s evidence to support that too). Yet because the dorsal fins of male orcas can grow up to six feet tall, the height of the fins may have a great tendency for the fins to naturally collapse or become wavy over time. However, it must be reminded that neither the shape or droop of a whale’s dorsal fin are not indicators of an orca’s health, or well-being.
If you have anymore questions about orcas and other marine mammals, feel free to email me at Animaltrainer104@aol.com
Hope you all have a great weekend everyone,