At SNBL, 78 percent of the monkeys are locked alone inside cages. Being caged alone is extremely distressing to monkeys, who are naturally social beings, and they develop abnormal behaviors like self-mutilation, incessant rocking, and hair-pulling.

Torn from his mother soon after birth, a baby monkey clutches desperately to a blanket.

This monkey rubs a swollen eye. The whistleblower reported that physical abuse by workers is common at SNBL.

For some experiments, monkeys were tethered to their cages with a metal tube that was surgically attached to their backs. Experimental chemicals were continuously infused into the monkeys' veins through the tube.

The monkeys were kept tethered to their cages for many months.

The monkeys would shiver and their teeth would chatter non-stop while they had ice-cold liquids pumped into their veins.

Monkeys used in tests had their blood drawn many times a day, resulting in swelling, redness, and bruising of their limbs. The monkeys generally did not receive any veterinary care for their injuries, which were considered "routine."

The monkeys' veins would rupture because of the repeated blood draws, and workers would poke and dig around in the limb to find other veins, exacerbating the monkeys' suffering.

Locked alone in a cage, this beagle is desperate for attention.