I agree, I think your problem here was trying to take nature with ( I assume ) a 28-55 ( you said 'kit' - doesnt' help a lot). Could do with at least something like a 70-300 for work like this.
The kit lens on an XSI is an 18-55.
If you want to start shooting wildlife, a good lens to start with is the Canon 55-250 IS, I have it and I love it.
you're early lol. look at the dateAgreed, I got that one too, I love it.