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 voyage of HMS Beagle from 1831 - 1836. The bird collection consists of skins, eggs and skeletal material. There are skeletal remains from extinct birds such as the dodo from Mauritius and the solitaire from Rodrigues in the collection. The insect collection contains specimens collected by Darwin from around Cambridge. Collections of molluscs, corals and other sea-dwellers offer insight into the biological diversity of the oceans.