Hi. I am running the as.ltraj () function in adehabitat (v 1.4 under R 2.2.1) but can't seem to correctly specify the burst argument. i.e., the ltraj object returned consists of only one component, when in fact my data consist of more than one burst of reloctions per animal. i've set up the data (xy, date, id, burst) in list form following the example given in ?as.ltraj. to simplify, following is a section of the data for the 65th animal in my list dataset: x y loctime burst 479347 5515636 2005-07-07 21:05:20 bird498 479405 5515729 2005-07-07 21:12:00 bird498 479397 5515740 2005-07-07 21:12:20 bird498 479388 5515740 2005-07-07 21:13:15 bird498 479398 5515724 2005-07-07 21:16:20 bird498 479416 5515717 2005-07-07 21:20:00 bird498 479387 5515670 2005-07-07 21:34:00 bird498 479225 5515689 2005-07-08 10:04:25 bird499 479251 5515692 2005-07-08 10:06:33 bird499 479290 5515705 2005-07-08 10:08:31 bird499 479327 5515701 2005-07-08 10:09:29 bird499 479390 5515744 2005-07-08 10:20:03 bird499 479363 5515734 2005-07-09 09:18:24 bird500 479373 5515746 2005-07-09 09:20:00 bird500 479372 5515745 2005-07-09 09:20:30 bird500 479373 5515746 2005-07-09 09:20:50 bird500 479391 5515715 2005-07-09 09:22:40 bird500 479356 5515761 2005-07-09 09:28:11 bird500 479270 5515806 2005-07-11 13:50:10 bird501 479295 5515780 2005-07-11 13:55:15 bird501 479311 5515770 2005-07-11 13:57:30 bird501 479391 5515791 2005-07-11 14:05:10 bird501 479403 5515784 2005-07-11 14:08:25 bird501 and the code i input for this animal is: (mytr1 <- as.ltraj(myxy[[65]][1:2], date = myxy[[65]][3], id="animal65", burst=myxy[[65]][4])) i'm returned a list of class traj with only one component which identifies the animal, concatenates all unique burst character strings, and gives the total number of relocations. the burst data in my dataset are of the form is.character. Does anyone know what I'm doing incorrectly to be returned a list of only one component per animal (where number of relocations is total number of relocations per animal)? instead of the desired list with x components per animal (x number bursts) with associated number of relocations per burst? Thanks in advance. Tina Leonard M.Sc. candidate Department of Biology Acadia University Wolfville, NS CANADA [[alternative HTML version deleted]]