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207-Leroy morphed
Other languages: German: Mauseherz
Hungarian: Egércse
Russian: Барахольщик
Spanish: Mauzhertz
Notables: Handcuff Martin Burgess
Dead Mr. Burgess
Dead Reginald
Dead Katherine Nidaria
Leroy Estes
TV Show: "Of Mouse and Man"
"Last Grimm Standing"
"Cat and Mouse"
"The Bottle Imp"
"To Protect and Serve Man"
"Natural Born Wesen"
"One Angry Fuchsbau"
"The Wild Hunt"
Referenced: "Synchronicity"

A Mauzhertz (pronunciation: MOWTS-hairts, Grimm: MOWZ-hurts; Germ. Maus "mouse" + Herz "heart") is a mouse-like Wesen that are harmless and shy. They first appeared in "Of Mouse and Man".


Season 1Edit

"Of Mouse and Man"Edit

Martin Burgess was killing people in his neighborhood who challenged him due to an abusive life with his father. His victims would challenge him and become aggressive, and Martin's mind would turn them into his father. When cornered in his junkyard, he looked into a mirror and, horrified, saw himself as his father, allowing the police to arrest him.

"Last Grimm Standing"Edit

Sauly was a bookie who had many connections and sold tickets to various shady, underground events such as the Löwen Games. Monroe went to him for tickets to the Löwen Games, and threatened him with his Blutbad form. Sauly then gave him an address where someone would pick him up and take him to the games, when in reality Sauly set Monroe up to be taken in to fight.

"Cat and Mouse"Edit

Reginald was the owner of a camera store and made fake papers for members of the Resistance to get out of the country. He was first visited and threatened by Edgar Waltz for the location of Ian Harmon. Waltz threatened to kill his family if he didn't comply. Rosalee also came in to get fake papers for Ian. Reginald gave her the passport and money, along with a note saying "I'm sorry. I had no choice". He was later killed by Waltz.

Season 2Edit

"The Bottle Imp"Edit

Leroy Estes comes into the shop for an order that he made with Rosalee. He's extremely unbalanced and wobbly due to an unknown inner ear affliction. Monroe accidentally mixes in the wrong ingredient and, due to his mistake, the mixture that would have been Leroy's antidote instead made him act manically, cutting up furniture with a chainsaw. He is later knocked out by Monroe in his home, where Monroe proceeds to give him the correct serum.

"To Protect and Serve Man"Edit

An unknown inmate is seen among the other prisoners as Hank and Nick walk into the prison to speak to Craig Ferren about his ordeal seven years earlier.

"Natural Born Wesen"Edit

Leroy, the same Mauzhertz from "The Bottle Imp", is seen among the crowd of other Wesen in Rosalee's shop, demanding that Rosalee take action about the Gesetzbuch Ehrenkodex being broken. He and the rest of the crowd later leave, slightly disappointed about Monroe and Rosalee's responses.

"One Angry Fuchsbau"Edit

Katherine Nidaria is seen scared of Don Nidaria, her husband, in a flashback that occurred six months ago. Don is angry at her for wearing the wrong dress, and in a rage, Don throws Katherine off their balcony, killing her.

Season 3Edit

"The Wild Hunt"Edit

Leroy Estes goes to the spice shop to buy something that he has to steep for 15 minutes before and after every meal for a week.

Characteristics Edit

Upon woge, they gain beady eyes, whiskers jutting out from a pointed nose, more facial hair, large ears and oversized incisors. Female Mauzhertz have an overall similar woge, but don't gain extra facial hair, and have less pronounced whiskers. They do not have any strength enhancement and are generally quite weak.

Behavior Edit

Mauzhertzen are by nature, very timid and exceedingly cowardly, oftentimes afraid of their own shadow.

Mauzhertzen are very predictable which makes them easy prey for Lausenschlange, their natural predators.

Much like their Eisbiber cousins, Mauzhertzen are a friendly species, and will go out of their way to avoid trouble. Consequently Mauzhertzen have never been at odds with the Grimms. Prior to Nick Burkhardt recording Martin Burgess' murder spree, it is unlikely that a Grimm had ever recorded an instance of a rogue Mauzhertz, as Nick could find no mention of them in any of his Grimm Diaries, and required Monroe's help to identify them.

Despite their passive natures, Mauzhertzen can occasionally be found in the seedy parts of society. A good example of this would be Sauly who had connections and sold tickets for Leo Taymor's Löwen games. Likewise, Nick spotted at least one Mauzhertz in prison. ("To Protect and Serve Man")


See alsoEdit

Wesen in Grimm
Primate Wesen Hexenbiest, Wendigo, Musai, Hässlich, Siegbarste, Fuchsteufelwild, Wildermann, Naiad, El Cucuy, Koschie, Aswang
Rodent Wesen Eisbiber, Reinigen, Mauzhertz, Stangebär
Suinan Wesen Bauerschwein, Malin Fatal
Chiropteran Wesen Murciélago
Perissodactyl Wesen Nuckelavee, Dickfellig
Bovine Wesen Taureus-Armenta
Caprine Wesen Ziegevolk, Seelengut
Pantherine Wesen Löwen, Balam, Pflichttreue, Yaguaraté, Manticore
Feline Wesen Klaustreich
Machairodontine Wesen Mauvais Dentes
Vulpine Wesen Fuchsbau
Canine Wesen Blutbad, Hundjäger, Schakal, Coyotl, Höllentier, Wildesheer, Anubis
Ursid Wesen Jägerbar
Meline Wesen Drang-Zorn
Lutrine Wesen Luisant-Pêcheur
Sauropsidans Wesen Dämonfeuer
Chelonian Wesen Genio innocuo
Gekkotan Wesen Skalengeck
Serpents Wesen Lausenschlange, Königschlange
Pseudosuchian Wesen Skalenzahne, Gelumcaedus
Dinosaur Wesen Glühenvolk
Strigiform Wesen Scharfblicke
Cathartid Wesen Raub-Kondor
Accipitrid Wesen Steinadler, Geier
Passeriform Wesen Seltenvogel
Chelicerate Wesen Spinnetod
Hexapod Wesen Mellifer, Jinnamuru Xunte
Osteichthyan Wesen Cracher-Mortel
Agnthan Wesen Lebensauger
Grimm Season Two
Episodes "Bad Teeth" • "The Kiss" • "Bad Moon Rising" • "Quill" • "The Good Shepherd" • "Over My Dead Body" • "The Bottle Imp" • "The Other Side" • "La Llorona" • "The Hour of Death" • "To Protect and Serve Man" • "Season of the Hexenbiest" • "Face Off" • "Natural Born Wesen" • "Mr. Sandman" • "Nameless" • "One Angry Fuchsbau" • "Volcanalis" • "Endangered" • "Kiss of the Muse" • "The Waking Dead" • "Goodnight, Sweet Grimm"
Webisodes "Bad Hair Day"
Stars David Giuntoli as Nick Burkhardt Russell Hornsby as Hank Griffin Bitsie Tulloch as Juliette Silverton Silas Weir Mitchell as Monroe Sasha Roiz as Sean Renard Reggie Lee as Wu Bree Turner as Rosalee Calvert Claire Coffee as Adalind Schade
Recurring Shohreh Aghdashloo as Stefania Vaduva PopescuDanny Bruno as Bud WurstnerJames Frain as Eric RenardChristian Lagadec as Renard's ConfidantMary McDonald-Lewis as Frau PechReg E. Cathey as Baron SamediMary Elizabeth Mastrantonio as Kelly Burkhardt
Wesen BlutbadCracher-MortelEisbiberFuchsbauHexenbiest/Half-Zauberbiest
Mythology GrimmCoins of ZakynthosFourth CrusadeNick's KeyWesen WarsGesetzbuch EhrenkodexWesen CouncilEndezeichen GrimmWoge
Organizations Portland PoliceLauferVerrat
Diseases Fluvus Pestilentia
Locations Portland, OregonVienna, AustriaNick and Juliette's HomeMonroe's HomeSean Renard's HomeKronenberg CastleCentral Precinct Justice CenterForest Hills Storage
DVD/Blu-ray Grimm: Season Two
Seasons Season 1Season 2Season 3Season 4
Quotes Episode Quotes
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