Comparison of visual and passive acoustic estimates of beaked whale density off El Hierro, Canary Islands

1. Arranz, P.
2. Miranda, D.
3. Gkikopoulou, K.C.
4. Cardona, A.
5. Alcazar, J.
6. Aguilar de Soto, N.
7. Thomas, L.
8. Marques, T.A.