"Mutt Guppies" - a term used for hybrid guppies. In my case, it was crosses between Red Tail Dragon, HBB and Black Mosco females with PDERT, Black Moscow, Swordtail and HBB males.
Some turned out to look quite exotic. For example, I have what look like Red Fantail Koi, Black Tail Dumbo Ear and Tiger Split Swordstails.
These are the "juvenile delinquent males" in "The Australia Tank - my DIY 15 gallon "Tall" column I created a couple weeks ago.
They just love playing rough with the other males.
Note: I've had to remove two of the origiinal 12 because they got so beat up that they were on the verge of dying from exhaustion and suffered from multiple fin and body nips!
Submitted FYI.
May you and yours be well and loving life today.
In Lak'ech,
JaiChai