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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for When mammals appeared 7 letters:

MIOCENE: When mammals appeared
OKAPIS: Mammals appearing on Congolese franc notes
JURASSIC: Period when birds and mammals appeared
EOCENE: Epoch when mammals appeared
EOCENE: Epoch when modern mammals appeared
TRIASSIC: Period when mammals first appeared
TRIASSIC: Mammals first appeared during it