Four Fathers on Father's Day

This Sunday, we pay tribute to fathers of all types: biological fathers, adoptive fathers, foster dads, and father figures. Hard-working pop would certainly appreciate the efforts of these four patriarchs of the animal kingdom:
Lion Around
Frazier was circus lion from Mexico, and by the time he turned 20 years of age, he'd seen better days. Almost toothless, his tongue lolled out of his mouth and his skin hung on his emaciated frame. In 1970, he was donated to Lion Country Safari in California to live out his final days. To everyone's surprise, Frazier was "adopted" by a pride of lionesses that had until that time had rejected the attention of all the park's male lions. Not only did these attentive females bring Frazier his food and prop him up to walk (one lioness on each side of him), they tended to his other lionly needs. Frazier sired 30 cubs during his first year at the reserve, and continued to be just as prolific the rest of his life. He passed away in 1972 due to natural causes (if you count "exhaustion" among those causes).