Reading about a land bridge makes me think about the Swiss Family Robinson movie.
In the movie they are stranded on a tropical island that just happens to have all kinds of African animals on it, many of which had no business being on a smallish island, since they were too large to establish a real population there.
Some of the animals came with the Robinsons, of course, but not all of them.
And the explanation in the end is that the island was recently attached to the mainland by an isthmus or land bridge or was perhaps the remains of a land bridge that had since disappeared.
It still didn't make any sense, since the animals were all from different areas of Africa and India but at least it tried to give somewhat of an explanation as to why they kept coming across monkeys and tigers and ostriches.