non existent host/domain

[R Joseph Wright]

I just set up a primary dns server using Bind 8 on FreeBSd 4.0.  I also
just registered my domain, got my secondaries set up with
granitecanyon.com, etc.  So, I'm set, sort of.  The main problem that is
happening is I get this when I do 'nslookup mammalia.org':

Server:  localhost.org
Address:  127.0.0.1

*** localhost.org can't find mammalia.org: Non-existent host/domain

It works fine if I do 'nslookup manatee.mammalia.org':

Server:  localhost.org
Address:  127.0.0.1

Name:    manatee.mammalia.org
Address:  216.231.50.6

***Here is my named.conf***
***************************

options {
	directory "/etc/namedb";
	forwarders {
		216.231.41.2;	216.231.41.22;
};
zone "." {
	type hint;
	file "db.cache";
};
zone "0.0.127.in-addr.arpa" {
	type master;
	file "localhost.rev";
};
zone "mammalia.org" {
	type master;
	file "db.mammalia";
};
zone "50.231.216.in-addr.arpa" {
	type master;
	file "mammalia.rev";
};

***Here is db.mammalia***
*************************

; Definition of zone mammalia.org
mammalia.org.	IN  	SOA  manatee.mammalia.org.  rjoseph.mammalia.org. (
		2000260401  	;  Serial (date,  2 digit version of day)
		86400		;  refresh  (1 day)
		7200		;  retry  (2 hours)
		8640000		;  expire  (100 days)
		86400 )		;  minimum  (1 day)
; Name servers
		IN	NS	ns
ns		IN	A	216.231.50.6
; MX records
		IN 	MX	10  manatee.mammalia.org.
; Hosts
manatee		IN  	A  	216.231.50.6
; Aliases
www		IN	CNAME   manatee	
; System Information
manatee		IN	HINFO	"AMD K6-2/450"	"FreeBSD 4.0-STABLE"

***Here is mammalia.rev***
**************************

@	IN	SOA	manatee.mammalia.org. rjoseph.mammalia.org.  (
				2000260401	; Serial
				86400		; Refresh
				7200		; Retry
				8640000		; Expire
				86400 )		; Minimum
	IN	NS	ns.mammalia.org.
6	IN	PTR	manatee.mammalia.org.

***Here is localhost.rev***
***************************

$TTL	3600

@	IN	SOA	mammalia.org. rjoseph.mammalia.org.  (
				2000260401	; Serial
				3600		; Refresh
				900		; Retry
				3600000		; Expire
				3600 )		; Minimum
	IN	NS	mammalia.org.
1	IN	PTR	localhost.org.

I do apologize for the length of the message, but this way I figure I've
got all bases covered =).