-ER or -EST?

"Hello, my name is Dennis and I'm a professional guide. I love my job here, in the Kruger Park.
It's one of the bigg national parks in Africa.
Temperatures in summer are high than in winter, so my job is sometimes hard in June or in July than during the next ten months.
In summer we also work long hours than in winter but I don't care.
People working in an office may be bett-paid than me but I love working outside.
I've always been interested in wild animals. The funni are baboons.
Giraffes are the tall mammals here but they are not the fast.
Cheetahs are much fast than them.
I have the b job I can think of!