Carcass persistence time of small wildlife on roads

We measured the persistence time of small-bodied carcasses on road surfaces using amphibians (Pelophylax kl. esculentus) and a variety of small passerine species. Median persistence times for this species were previously estimated at 24 hours, these experiments aim at fine-tuning these estimates by following the disappearance of carcasses in intervals of 2 hours in varied weather, road traffic volume conditions, and carcass position on the road lane.

Raw data is available in 'Data.csv' and is organized as follows:
day of the experimental trial (day-month)
coordinates of the trial
observer ID
name of the road
species (amphibian/passerine)
weather conditions (dry day/day with continuous rainfall)
daily road traffic volume obtained from local authorities
ID of the carcass
disappearance interval: lower bound, upper bound (upper bound marked as 'inf' in the case of right-censoring)
carcass position on the lane (in tire tracks, outside tire tracks)

Example:
Amphibian 1 from the D23 road (traffic: 4160 vehicles/day) disappeared between the moment it was placed on the road (t=0) and the first survey (t=2 hours).

--

Add_experiment.csv >
Continuous following of small passerine disappearance from road, on a dry day at location 'Caluire_Saone'.
Carcass ID
Position on the lane
Carcass bodymass
Time elapsed between placement on the road surface and disappearance or end of trial (minutes)
Number of vehicles on the lane between placement on the road surface and disappearance or end of trial
Right censoring status: 0 = has not disappeared before the end of the trial / 1 = has disappeared from road