When Acres' deputy chief executive, Mr Kalai Vanan Balakrishnan, arrived in Buona Vista last week to remove a paradise tree snake from an office, he did not expect to see the 50cm-long snake taped to the carpet with industrial tape.
The adult snake also had a bleeding wound on its back as someone had tried to impale it.
"People are usually afraid of snakes and that's okay. But by doing this, you're really asking for trouble - the animal will feel scared and threatened, and things can go wrong," said Mr Kalai, 31, who was a wildlife rescuer for about four out of his seven years at Acres.
Acres does not keep numbers on cases of wildlife abuse but Mr Kalai, who still helps with rescues when manpower is short, has been noticing more of such incidents.
The non-profit organisation receives about 600 calls a month on its 24-hour wildlife rescue hotline, the only one of its kind in Singapore.
While those who call the hotline mostly leave the animals alone, some hurt the animals when they try to pin them down, he said.
What to do if you spot a snake
Some of the common snakes native to Singapore include the reticulated python, paradise tree snake, common wolf snake, oriental whip snake, and the venomous equatorial spitting cobra.
While the paradise tree snake and oriental whip snake are mildly venomous, their bite is not dangerous to humans.
Snakes do not seek to attack people and are generally timid, said wildlife naturalist Serin Subaraj. They strike only if cornered or handled inappropriately.
"If you respect the distance, they will eventually move on," said Mr Serin, 22, co-founder of the Herpetological Society of Singapore. Herpetology is the study of amphibians and reptiles.
If you encounter a snake in trees, drains or green spaces, leave it alone as these are their natural habitats. When walking along waterways or trails, be mindful of your pathway.
Snakes may end up in urban areas when they are tracking their prey. In these areas, they may end up injured if they are hit by a vehicle.
If you encounter a snake under these circumstances, keep a distance and monitor the snake's movement.
You can call the Acres wildlife-rescue hotline on 9783-7782 and provide information on the snake, such as its length, thickness and colour or markings.
This is particularly so for reptiles such as snakes, as well as birds. For every 10 calls related to snakes, Mr Kalai estimated that up to two are abused. Acres once responded to a snake-rescue call from a pre-school only to find a dead young spitting cobra. Someone had stacked at least three cardboard boxes on top of the reptile, which was 30cm to 40cm long, killing it.
Ms Anbarasi Boopal, who is also Acres' deputy chief executive, said such actions stem from inadequate education on the native wildlife.
"Singapore is creating a lot of greenery and it's never going to be just butterflies and flowers. There's going to be lizards, snakes."
Acres often gets calls about sightings of animals where a rescue is not necessary, she said. Last year, it received about 55 such calls a month, including sightings of small snakes on trees and monitor lizards in community gardens.
To curb this, Acres is ramping up efforts to educate the public on what to do when they encounter some of the common wildlife here.
Earlier this year, for example, it started working closely with and educating property managers of town councils, who are usually the first responders when the public encounter wildlife in a housing estate.
Acres said it hopes the campaign will help reduce misconceptions about Singapore's wildlife.