BUCHAREST, April 6 (Reuters) - At the dolphinarium in the Black Sea port city of Constanta, Romanian and Ukrainian trainers are letting dolphins guide them despite language barriers. The dolphins - Kiki, Maya, Marusia and Veterok - and sea lions - Alex, Mary and Zosya - were immediately moved to Odessa, where they waited for two months for Romanian and Ukrainian officials to complete the carousel of paperwork needed to bring them into the EU. See here for a complete list of exchanges and delays