1. Introduction
  1.1 Background
  1.2 Objectives
  1.3 Significance of the Study

2. Anatomy of the Lymphatic System
  2.1 Overview of the Lymphatic System
  2.2 Lymphatic Vessels
  2.3 Lymph Nodes
  2.4 Lymphatic Organs

3. Comparative Anatomy of the Lymphatic System
  3.1 Mammals
      3.1.1 Structure and Function of the Lymphatic System in Mammals
      3.1.2 Comparative Analysis of Lymphatic System in Different Mammalian Species
  3.2 Birds
      3.2.1 Structure and Function of the Lymphatic System in Birds
      3.2.2 Comparative Analysis of Lymphatic System in Different Avian Species
  3.3 Reptiles
      3.3.1 Structure and Function of the Lymphatic System in Reptiles
      3.3.2 Comparative Analysis of Lymphatic System in Different Reptilian Species
  3.4 Marine Animals
      3.4.1 Structure and Function of the Lymphatic System in Marine Animals
      3.4.2 Comparative Analysis of Lymphatic System in Different Marine Species

4. Functional Variations of the Lymphatic System
  4.1 Immune Cell Populations in the Lymphatic System
  4.2 Lymphatic System Adaptations in Different Animal Species
  4.3 Implications for Veterinary Medicine

5. Methodology
  5.1 Literature Review
  5.2 Comparative Analysis of Existing Data
  5.3 Data Collection and Analysis