He or She? Sometimes gender is easy to distinguish even at a distance and sometimes you have to get up close and examine the animal. In many pinnipeds there are a number of features that often make gender ID fairly straightforward even when the animal is rather decomposed. For example, adult male California sea lions have a bony ridge called a sagittal crest which gives them a very prominent forehead. This secondary sexual characteristic is only found in adult males and thus, can help you determine both age and sex at a distance. Pinnipeds, like dogs, also have a bone in their penis called a baculum see above image.
No evidence for clonal transmission of | Wellcome Open Research
To investigate the role of bacterial cofactors in the development of urogenital cancer, we took vaginal and preputial swabs for bacterial isolation from free-ranging and 48 stranded California sea lions Zalophus californianus , including 13 animals with urogenital carcinoma. Aerobic bacteria were isolated from A total of isolates were identified representing 51 unique bacterial species. The mean number of isolates per animal was 2.