 Complete the following phrase:  Before the redevelopment a 21.3 m 70 ft finback whale skeleton, colloquially known as Bobby, was displayed at the entrance of the museum; it was dismantled and stored during the redevelopment. The new interior entrance hall now contains this skeleton which was extensively cleaned before being reassembled. Skeletons and preserved skins of many extinct animals are housed in the museum. Most of the fish specimens are stored in spirit, some of them having been collected by Darwin himself on the 