Animal welfare charities reacted angrily today as the Government released details of the 3.87 million experiments carried out on mammals, birds and fish last year.The experiments were described as causing “’unacceptable levels of suffering” and the Government came under attack for failing to reduce the numbers of animals used in laboratories.  Critics say 184,00 procedures deemed to be at the severest level were carried out – a figure twice the seating capacity of Twickenham.  Announcing the figures, the Home Office said the statistics showed the number of scientific procedures carried out on animals had fallen by six per cent from 4.12m procedures during 2013 to 3.87m in 2014.