| Title | Date | Type | Setname | ||
|---|---|---|---|---|---|
| 301 |  | Los niños del Sol | 2009; 2010 | Image/MovingImage | uum_hif |
| 302 |  | Lowell memories | 2010; 2011 | Image/MovingImage | uum_hif |
| 303 |  | MacGillivray's Warbler | Sound | uu_wss | |
| 304 |  | Mallard (0702-302) | Sound | uu_wss | |
| 305 |  | Marsh Wren (090410-18) | 2009-04-10 | Sound | uu_wss |
| 306 | | Marsh Wren (090410-S03) | 2009-04-10 | Sound | uu_wss |
| 307 |  | Marsh Wren (100515) 1 | 2010-05-15 | Sound | uu_wss |
| 308 | | Marsh Wren (100515) 2 | 2010-05-15 | Sound | uu_wss |
| 309 |  | Mew Gull 1 | Sound | uu_wss | |
| 310 | | Michael's world | 2011 | Image/MovingImage | uum_hif |
| 311 |  | Moose 1 | 2008-07-14 | Sound | uu_wss |
| 312 | | Moose 2 | 2008-07-14 | Sound | uu_wss |
| 313 |  | Moose extended (080714_Telinga_n) | 2008-07-14 | Sound | uu_wss |
| 314 |  | Moosehorn Lake (080723_T2_MSdn) | 2008-07-23 | Sound | uu_wss |
| 315 | | Moosehorn Lake (080723_T3_MSd) | 2008-07-23 | Sound | uu_wss |
| 316 | | Moosehorn Lake (080724_T04_MSdn) | 2008-07-23 | Sound | uu_wss |
| 317 | | Moosehorn Lake (080724_T05_MSdn) | 2008-07-24 | Sound | uu_wss |
| 318 |  | Mormon Cricket | Sound | uu_wss | |
| 319 |  | Mountain Bluebird | Sound | uu_wss | |
| 320 | | Mountain Bluebird (080709-395) | 2008-07-09 | Sound | uu_wss |
| 321 |  | Mountain Chickadee | Sound | uu_wss | |
| 322 |  | Mountain Goat | 2008-07-23 | Sound | uu_wss |
| 323 |  | Mule Deer startle exhalation | 2006-08-17 | Sound | uu_wss |
| 324 |  | Muskrat | 2005-10-07 | Sound | uu_wss |
| 325 | | Muskrat (070313-316) | 2007-03-13 | Sound | uu_wss |