Charging down a tank is pretty hopeless. Tank v. Rhino -> Goodbye Rhino.
If anything gets in the way of a tank's main weapon it is also game over.

So what can stop a tank? Well even an M1 can get stuck in soft ground. My image is of a trap forming species. It tunnels underground forming caverns, with a fairly weak covering of surface soil and a sticky mud (made stickier by the addition of its saliva) underneath.

When the tank goes over, the soil cap collapses, and the tank becomes mired. Getting out of the mud is possible, but it takes time and the personnel need to get out of the tank and dig. When they do, the animal strikes from side tunnels it has made specifically for the purpose of moving from one trap to another.

It evolved to prey on large animals: rhino, elephant or iguanodon, which it captures in the same way. Animals will at times become stuck in waterholes which leaves them open to predation by lions. To subdue a large animal like a rhino, it would need to have some kind of venom, perhaps one that causes rapid paralysis, since if the rhino (or tank) can escape then the rhino has the advantage.

The overall image is an animal that has evolved to hunt Elephants in the way that a spider hunts flies. Its traps can disable a tank, and attempts to recover it leave the crew vulnerable.

Charging down a tank is pretty hopeless. Tank v. Rhino -> Goodbye Rhino.
If anything gets in the way of a tank's main weapon it is also game over.

So what can stop a tank? Well even an M1 can get stuck in soft ground. My image is of a trap forming species. It tunnels underground forming caverns, with a fairly weak covering of surface soil and a sticky mud (made stickier by the addition of its saliva) underneath.

When the tank goes over, the soil cap collapses, and the tank becomes mired. Getting out of the mud is possible, but it takes time and the personnel need to get out of the tank and dig. When they do, the animal strikes from side tunnels it has made specifically for the purpose of moving from one trap to another.

It evolved to prey on large animals: rhino, elephant or iguanodon, which it captures in the same way. Animals will at times become stuck in waterholes which leaves them open to predation by lions. This animal has evolved to take advantage of this kind of situation by creating its own traps. However, To subdue a large animal like a rhino, it would need to have some kind of venom, perhaps one that causes rapid paralysis, since if the rhino (or tank) can escape then the rhino has the advantage.

The overall image is an animal that has evolved to hunt Elephants in the way that a spider hunts flies. Its traps can disable a tank, and attempts to recover it leave the crew vulnerable.