In the composition pattern is there a way to inherit only specific properties of a source object?

// with Object.assign I can inherit from multiple objects

let fish={
          laysEggs: true,
          habitat: "water"
          };

let dog={
            breaths: "air",
            habitat:" land"
           };

let newt=Object.assign({},dog,fish); 
/*note I can have fish.habitat be the thing newt inherit
s by placing last so it over rides the dog.habitat*/

//but what if I want specific properties from each 
/* what if the properties I needed weren't set up in a nice order 
that allowed the ones I didnt want to be overridden */
//for example if they had the same property names with different values this wouldnt work

let mammal={
             births:"live",
              has: "hair",
              metabolism: "warm blooded"
          };

let reptile={
           births: "eggs",
           has:"scales",
           metabolism: "cold blooded"
};

let platypus=Object.assign({},mammal,reptile);

let platypus2=Object.assign({},reptile,mammal);
//or if both had one property I didnt want
let mammal2={
             births:"live",
              has: "hair",
              metabolism: "warm blooded"
          };

let reptile2={
           births: "eggs",
           has: "scales",
           metabolism: "cold blooded"
};

let platypus3=Object.assign({},mammal2,reptile2);

let platypus4=Object.assign({},reptile2,mammal2);

/*no matter which one I put first, I'm either going to have a platypus 
with scales or one that gives live births*/
/*the only way to avoid this would be to be able to select which
 properties from each object, you want or delete the properties
 you dont want after creating the object.*/

/*So my questions is there a way to select which properties 
you from each object and leave other out, when combining objects?*/