Table 1. Experimental Subjects.

Subject	Birth year	Age (years)	Body Length (cm)	Mass (kg)	Birth Location
Filou	2006	4	130	68.4	captivity
Luca	2002	8	143	84.5	captivity
Malte	1999	11	141*	108.5	captivity
Nick	1999	11	161	102	captivity
Bill	1998	12	150	94	captivity
Henry	1997	13	151	75	captivity
Sam	1994	16	153	89	captivity
Marco	1982	28	143	85.5	unknown

Body length follows American Society of Mammalogists standards [77].

^*This subject lacks the small tail in between the hind flippers (average tail length: 8 cm).