NGC 2936 is an interacting spiral galaxy located at a distance of 326 million light years, in the constellation Hydra. NGC 2936 is interacting with elliptical galaxy NGC 2937, located just beneath it. They were both discovered by Albert Marth on Mar 3, 1864.. To some astronomers, the galaxy looks like a penguin or a porpoise. NGC 2936, NGC 2937, and PGC 1237172 are included in the Atlas of Peculiar Galaxies as Arp 142 in the category “Galaxy triplet”.

On 20 June 2013, the Hubble Space Telescope examined and photographed NGC 2936.

NGC 2936 was once part of a flat, spiral disk. The orbits of the galaxies stars have been mixed due to gravitational tidal interactions with NGC 2937. Gas from the center of NGC 2936 became compressed out during the encounter with NGC 2937, which is shown as blue knots closest to NGC 2937. The red dust that has been inside the center of the galaxy has been mostly thrown out due to the collision. During the collision, gas coming from NGC 2936 triggered star formation.