The new building has two areas filled with interactive features to aid learning.
A survey of heathland birds found a record 97 pairs of Dartford Warblers at RSPB Arne in Dorset.
The Humpback surprised the fisherman in the sea of Brixham in Devon.
The dead fish, at Saundersfoot and Pembrey beaches, were probably part of a discarded catch.
The Woodland Trust calls it a "once in a lifetime opportunity" to secure additional land.
Wildlife including sand lizards, deer and badgers are using a bridge linking two heathland sites.
Eastleigh council's ecologist says wildlife monitoring helps to inform land management plans.
Den-building is vitally important, but needs to be done in the right places, wildlife expert says.
The group says without its services thousands of animals would be left to die on London's streets.
