Tranquiliser darts were used to sedate the stray animals at the prestigious University of Moratuwa but many died from the dose, activists said today.
"This is cruel and brutal treatment of animals and we want action taken against those responsible," animal rights activist Wibodha Ambeygoda told AFP.
She said university authorities removed paralysed animals from the campus and dumped them 20 kilometres (12 miles) away to die.
A spokesman for the university said a private company was contracted to cull the stray animals from the campus.
Six people were jailed in March last year after posting photos online showing them skinning a sea eagle alive.