sac

Froome's wife Michelle has since told The Times, external that doctors discovered a pericardial rupture - an injury where the sac that surrounds the heart is torn - during surgery which they were able to repair.

The organism’s various states of evolution — as an egg sac or the Facehuggers that hatch from them — are back too.

The female will then store the sperm in structures called spermathecae and eventually construct an egg sac where the eggs remain until they hatch the following spring or summer, said Sarah Crews, from the California Academy of Sciences’ department of entomology.

NRW had previously confirmed that seven out of the nine most protected rivers in Wales - known as special area of conservation or SAC rivers - were failing water quality targets due in part to high levels of nutrients.

The situation has already led to limits being placed on housebuilding along SAC rivers.