Originally Posted by

**pcardoso** I'm working with bird fatalities in windfarms and one of the required parameters to estimate mortality is the probability of an animal remain in the field at a given time, in order to be available for detection while a field work session. (which will be another probability to be accounted for).

Typically bird carcass removal by animals will follow a negative exponential curve. It's very probable that a bird will be removed by a carnivore in the first few days after fatality. There are well described equations to evaluate mortality using there parameters.

What I'm trying to achieve is a exponential function with two particular behaviors. 1 - be limited by one at day zero.and tend to zero.

Any help will be appreciated