structural:summarization
Gecko mating experiment

On 19 July 2014, Roscosmos launched the Foton-M4 satellite containing, among other animals and plants, a group of five geckos. The five geckos, four females and one male, were used as a part of the Gecko-F4 research program aimed at measuring the effects of weightlessness on the lizards' ability to procreate and develop in the harsh environment. However, soon after the spacecraft exited the atmosphere, mission control lost contact with the vessel which led to an attempt to reestablish communication that was only achieved later in the mission. When the satellite returned to Earth after its planned two-month mission had been cut short to 44 days, the space agency researchers reported that all the geckos had perished during the flight.

The exact cause that led to the deaths of the geckos was declared unknown by the scientific team in charge of the project. Reports from the Institute of Medical and Biological Problems in Russia have indicated that the lizards had been dead for at least a week prior to their return to Earth. A number of those connected to the mission have theorized that a failure in the vessel's heating system may have caused the cold blooded reptiles to freeze to death.

Included in the mission were a number of fruit flies, plants, and mushrooms which all survived the mission.