What do longhom cowfish look like?

It sounds like you're thinking of a longhorn cowfish (Lactoria cornuta), which is a type of boxfish. They are indeed named for their horns, but they're not actual horns, more like bony projections extending from their head.

Here's what a longhorn cowfish looks like:

* Boxy Shape: They have a distinctive, boxy shape with a rigid, bony carapace.

* Large Horns: Their most prominent feature is their two long, sharp, bony horns that protrude from their head.

* Coloration: They are usually a bright yellow or orange color with darker spots or blotches.

* Size: They can grow up to about 12 inches (30 cm) in length.

Here's a more detailed description:

* Body: The body is compressed and rectangular, with a bony carapace that covers most of their body.

* Head: The head is small with a pointed snout and large, protruding eyes.

* Horns: The horns are pointed and can be quite long. They are used for defense and to help the fish maneuver in tight spaces.

* Mouth: The mouth is small and located on the underside of the head.

* Fins: They have small, rounded pectoral fins and a single dorsal fin.

* Tail: The tail is short and rounded.

Note: Longhorn cowfish are often mistaken for trunkfish, which also have boxy shapes and bony carapaces. However, trunkfish lack the distinctive horns of the longhorn cowfish.

If you want to see an image of a longhorn cowfish, simply search for "longhorn cowfish" on Google Images.