Robert Hall, The Zoologist (1900)
“ One day as many as eighty may be counted; the next day the same beach may only contain ten, with other heads poking above the floating-weed, and showing glassy round black eyes quite wide awake. Our men have often shot as many as sixty at one time, and found next day another twenty had come up among the dead, simply because it was their chosen lair. This species dislikes expending energy on land, and they will lie in a group of twenty to sixty in some grassy spot with a sandy landing. ”
