A tissue bank that will store genetic material from thousands of endangered animals has been set up in the UK. The Frozen Ark, as it is called, will preserve animal "life codes" even after their species have become extinct. This will allow future generations of scientists to understand long lost creatures, and may also help with the conservation programmes of tomorrow. The project is supported by the Natural History Museum, the Zoological Society of London and Nottingham University. Scientists believe animals may be disappearing from our planet at a very high rate. Some even refer to this plunge in biodiversity as the Earth's "sixth mass extinction". Over the next 30 years, perhaps a quarter of all known mammals and a tenth of all recorded bird species could die out - as result of rapid climate change and habitat loss. A multitude of less charismatic insects, worms and spiders are also said to be teetering on the edge. "Many people don't understand the current threat to biodiversity we face today," said the project patron Sir Crispin Tickell, of Oxford University. "Extinctions today probably equal the last five great extinctions.