Those L Lenses are professional quality - the 100-400 is $1400+ so for me there would need to be an awful lot of animals to shoot! I have the 2nd most popular lens (75-300 4.5-5.6 is)in the poll which I have rarely used. It's going MUSHing though!

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VOYAGER:
MC to FLL 11/07
MC/Dover 6/06
MARINER:
BCN / Ven 10/11
Alaska 2001|2006
Panama Canal 2003
NAV
Caribbean 11/06
Bermuda|New Eng/Canada 6/04
PG 5/05
OCEANIA
Nautica |Ist/Athens 6/07
Regatta|Baltics 6/08
Riviera 2013 Crossing -Istanbul to Miami