A dog on its owner’s grave. A killer whale carrying around its dead calf. A goose that isolates when its mate dies. These behaviors in animals may look like human mourning, but should scientists call them "grief?"For more, go to http://vox.com/unexplainableIt’s a great place to view show transcripts and read more about the topics on our show.Also, email us! unexplainable@vox.comWe read every email.Jennifer Vonk's research study on pet cats reactions to the death of companion animals can be found here. Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices