Problem: London landmarks - Which building was built principally for the Great Exhibition held in London in 1851 ?
Answer: crystal palace

Problem: What is the collective name for a flock of geese in flight, especially in V-formation?
Answer: skein

Problem: A two word answer is required. Bufo calamita is the scientific name for which amphibian, rare in Britain?
Answer: natterjack toad

Problem: Pinniped refers to a mammal with feet which are what?
Answer:
fins